One canned juice drink is 30 percent orange juice, another is 10 percent orange juice. how many liters of each should be mixed together in order to get 20l, that is 12 perfect orange juice

Answers

Answer 1
let there be x litters of 30 percent juice and (20-x) litters of 10 percent juice.

0.30x+0.10(20-x)=20*0.12
0.3x+2-0.1x=2.4
0.2x=0.4
x=2
20-x=20-2=18

mix 2 litters of 30 percent juice and 18 litters of 10 percent juice.

Related Questions

How do you solve: -1= 5+x/6

Answers

-1 = 5 + x/6
-6 = x/6   (multiply by 6 on both sides to cancel off the 6 on the denominator)
-36 = x 

hope this helps , give brainliest 

−1 = 5 + x6
Step 1: Simplify both sides of the equation.
−1 = 5 + x6
−1 = 5 + 16x
−1 = 16x + 5
Step 2: Flip the equation.
16x + 5 = −1
Step 3: Subtract 5 from both sides.
16x + 5−5 = −1−5
16x = −6
Step 4: Multiply both sides by 6.
6*(16x) = (6)*(−6)x = −36
Answer: x = 36

The first three terms of a sequence are 1, 2 and 3. each subsequent term is the sum of the three previous terms. what is the 11th term of this sequence? pattern

Answers

Final answer:

The 11th term of the sequence, where each term is the sum of the three previous terms starting with 1, 2, and 3, is 423.

Explanation:

The sequence is defined such that each term is the sum of the three previous terms, starting with 1, 2, and 3. To find the 11th term, we continue the sequence based on its pattern:

1 (given)

2 (given)

3 (given)

6 (1+2+3)

11 (2+3+6)

20 (3+6+11)

37 (6+11+20)

68 (11+20+37)

125 (20+37+68)

230 (37+68+125)

423 (68+125+230)

Therefore, the 11th term of the sequence is 423.

Luis has a $10 bill and three $5 bills. He spends $12.75 on the entrance fee to an amusement park and $8.50 on snacks. How much money doe she have left

Answers

Answer:

She has a total of $3.75 left

Step-by-step explanation:

Step 1

Express the amount of money Luis had in the beginning as follows;

A=E+R

where;

A=initial amount he had at the beginning

E=total expenditure

R=total remainder after spending

In our case;

A=(1×10)+(3×5)=$25

E=Amount spent at amusement park+amount spent on snacks

E=(12.75+8.50)=$21.25

R=unknown=r

Step 2

Substitute the values in the expression and solve for A;

25=21.25+r

r=25-21.25=3.75

r=3.75

She has a total of $3.75 left

Find the best of a parallelogram if the area is 10 cm2 and the height in 2cm

Answers

I believe the answer would be length = 2.5, because when you multiply 2.5 • 2, its 5. And there are 4 sides on a rectangle, so the equation is 2.5•2 twice, which equals 10cm². Which proves the answer. Hope I helped. (⊃≥ω≤)⊃

Suppose that water is being pumped into a trough. the trough is $$15 feet long, and every cross section of the trough is an equilateral triangle, with a vertex of the triangle pointing toward the ground. find the rate of change of the height of the water when the height is $$4 feet, if the volume of water is increasing at a rate of $$8 cubic feet per second.

Answers

I think it is the answer so that might be

Larry Lazy purchased a one year membership at a local fitness center at the beginning of the year. It cost him $150. He goes twice a week for the first three months (13 weeks) of the year, but then goes only once a month for the rest of the year.

How much does each visit to the center cost?

If he continued going twice a week all year, how much would each visit cost?

Answers

Question 1: 4.29
Question 2: 1.48

Answer:

A. $4.29

B. $1.44

Step-by-step explanation:

A. We have been given that Larry goes to gym twice a week for 13 weeks. Let us multiply 13 by 2 to find the number of times Larry visited the gym for first 3 months.

[tex]\text{The number of Larry's visits to gym for the first 3 months}=13\times 2=26[/tex]

Since there are 12 months in a year, then Larry has gone to gym only 9 times for rest of month as 12-3=9.

Now let us add 26 and 9 to get the total number of Larry's visits to gym.

[tex]\text{Larry's total visits to gym}=26+9[/tex]

[tex]\text{Larry's total visits to gym}=35[/tex]

Now let us divide total cost (150) by total number of visits (35) to get the each visit's cost.

[tex]\text{Each visit's cost}=\frac{150}{35}[/tex]

[tex]\text{Each visit's cost}=4.2857142857142857\approx 4.29[/tex]

Therefore, each visit to the center costs $4.29 to Larry.

B. If Larry continued going twice a week all year, then total number of Larry's visits to center will be 52 times 2.

[tex]\text{Larry's total visits to center}=52\times 2[/tex]

[tex]\text{Larry's total visits to center}=104[/tex]

Now let us divide total cost (150) by total visits (104) to find the cost of each visit.

[tex]\text{Each visit's cost}=\frac{150}{104}[/tex]  

[tex]\text{Each visit's cost}=1.4423076923076923\approx 1.44[/tex]

Therefore, If Larry continued going twice a week all year, it would cost  him $1.44 for each visit.


Is the square root of 38 rational or irrational?

Answers

If a positive integer is not a perfect square (like 38) is its square root always anirrational number

Write an inequality that represents the sentences:
What is the product of g and 2 is less than -6

Answers

g×2<-6

G would equal -3.5 and anything less such as -4 or -5.

Please vote my answer brainliest. thanks!

How do find perimeter and area for this?

Answers

Split each part into the same sections. You might want to use a ruler

Penny translate a trapezoid so that one of the vertices is at the origin. if the pre-image has a perimeter of 44 units what is the perimeter of the image

Answers

Translations are part of rigid motions which also include reflection and rotation. For these three, we can then assume that neither the perimeter nor the area of an object would change. This means that, once an object is translated it is not biased or distorted (either enlarged or diminished). Thus, making the perimeter of the original and the image are equal. So for this problem, the perimeter of the image would be the same as the pre-image, and that would be 44 units. 

Final answer:

In the context of geometric transformations, the shape and size do not change, only position. Therefore, if the trapezoid's pre-image has a perimeter of 44 units, the image, as a result of translation, will have the same perimeter of 44 units.

Explanation:

In the context of geometric transformations like translations, rotations, or reflections, the shape and size of the object do not change--only its position does. The pre-image and the image are congruent, so their perimeters are the same.

In the situation described in your question, Penny's trapezoid is translated so that one of its vertices is at the origin. Because a translation is a type of isometry (a transformation that preserves distance), the shape of the trapezoid and the lengths of its sides will not change in the translation process. As a result, if the perimeter of the pre-image is 44 units, then the perimeter of the image will also be 44 units, regardless of where the vertices are located.

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Simplify
8 - [- ( - 3 )]
A. 5
B. -5
C. 11
D. -11

Answers

Hey Miranda!

Let me help you out...

First, keep in mind that they just put these negative signs to make the thing looks difficult to solve :)

Do you remember this:
[tex]Minus * Minus = Plus [/tex]

Well this the same thing. We gonna multiply the two negative signs that are behind the parentheses together and make it plus sign

Here is how it works
[tex]8-[-(-3)] =8 + (-3) =8 - 3 =5[/tex]

The correct answer is option A (5)

Good luck with your studies, Miranda.

which is a perfect square a. 6^1 b. 6^2 c. 6^3 d. 6^5 (need answer now pls)

Answers

Hello there! 6^1 is not a perfect square. It's basically it's own number and 6 is not a perfect square. Therefore, A is out. 6^3 (216) is cubed, not squared, so C is out as well. Just by looking at the exponents, 6^2 is squared and 36 is a perfect square, so the answer is B: 6^2.

The perfect square expression is (b) 6^2

How to determine the perfect square?

A perfect square is any expression that can be represented as:

x^2

Where x is a real number

From the list of options, we have: 6^2

i.e.

x^2 = 6^2

Hence, the perfect square expression is (b) 6^2

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what is 165.2 diveded by 3 times 10 plus 65 minus 82 divided by 100 times 65 plus 1

Answers

Hello there!

165.2/3 * 10 + 65 - 82/100 (65) + 1
= (55.066667)(10) + 65 - 82/100 (65) + 1
= 1652/3 + 65 - 82/100 (65)  + 1
= 1847/3 - 82/100 (65) + 1
= 1847/3 - 41/50 * 65 +1
= 1847/3 - 533/10 + 1
= 16871/30 + 1
= 16901/30

Edited: That is 563.37 in decimal

Good luck!

Answer: 563.37 hahaha

Step-by-step explanation:

Let f(x) = 4 – x^2-, g(x) = 2 – x. Find (f + g)(x) and its domain.

Answers

(f+g)(x)=(2-x)(2+x)+(2-x)=(2-x)(2+x+1)=(x+2)×(x+3)=x^2+5x+6 & Domain=R

in 35 days a person saved $70 what was the person's average daily savings

Answers

take the $70 and divide it by 35days. answer is $2 daily

The person's average daily savings is $2.00. The correct answer is option b $2.00.

Step 1

To find the average daily savings, we need to divide the total amount saved by the number of days over which the savings occurred.

Calculation:

1. Total savings: $70

2. Number of days: 35 days

Step 2

The average daily savings is calculated as:

[tex]\[\text{Average daily savings} = \frac{\text{Total savings}}{\text{Number of days}} = \frac{70}{35} = 2\][/tex]

The person's average daily savings is $2.00.

Complete question : In 35 days, a person saved $70. What was the person's average daily savings?

a $0.70

b $2.00

c $1.50

d $1.05

e $2.33

f none of these

Determine whether each conjecture is true or false given: n is a real number
Conjecture: n^2 (squared) is a nonnegative number

Answers

For the conjecture to be true, the square of all real numbers must be positive or zero.
The square of all negative and positive numbers is positive, and the square of zero is zero, so the conjecture is true.
Final answer:

The conjecture that any real number squared is a nonnegative number is correct. This is because squaring a positive number gives a positive result, squaring a negative number also gives a positive result, and squaring zero equals 0, which is nonnegative.

Explanation:

This mathematical conjecture proposes that for any real number, when squared, the result is a nonnegative number. Given n is a real number, the conjecture n^2 is a nonnegative number is indeed true. In mathematics, a real number is considered nonnegative if it is greater than or equal to zero.

To provide more insight, let's look at a few examples: If we take a positive number such as 3, and you square it (3^2), you get 9, which is a positive number. Equally, if you take a negative number like -3 and square it (-3^2), you get 9 again, which is also a positive number. Even if you take the number zero (which is neither positive nor negative) and square it, you get 0, which is still considered nonnegative. Thus, any real number when squared is always a nonnegative number.

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What is the surface area of a sphere with a radius of 13 units?

Answers

Answer:

676pi units ^2

Step-by-step explanation:

apex

The surface area of a sphere with a radius of 13 units is 676π²

What is surface area?

explaination;

Given radius = 13 units

surface area of a sphere = 4πr²

                                          = 4 * 13*13 π²

                                          676π² answer.

The surface area is the sum of the areas of all its faces.The areas of the base, top, and lateral surfaces i.e all sides of the object. It is measured using different area formulas and measured in square units and then adding all the areas. The surface area of a solid object is a measure of the total area that the surface of the object covers.

The floor region of a strong object is a measure of the full vicinity that the floor of the item occupies. The mathematical definition of surface vicinity within the presence of curved surfaces is extensively extra involved than the definition of arc length of 1-dimensional curves, or of the floor area for polyhedra for which the surface place is the sum of the areas of its faces. clean surfaces, such as a sphere, are assigned floor region using their representation as parametric surfaces. The definition of floor area is based totally on methods of infinitesimal calculus and includes partial derivatives and double integration.

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how many decimal places should be in the answer if 2.214 is added to 6.3

Answers

3 decimal places. If we added 2.214 to 6.3

Kaitlin brought 7 cans of cola to a party. lisa brought 18 packs of cola, and each pack had 6 cans. how many cans did they bring in all?

Answers

138 cans
18*6=96
7*6=42
42+96=138

It takes 36 minutes for 7 people to paint 4 walls. How many minutes does it take 9 people to paint 7 walls?

Answers

Seeing as 7 people get 4 walls in 36 minutes, we can say that the amount of walls one person gets done in 36 minutes is 4/7 (due to that if 7 people=4 walls, we can divide both sides by 7 to get 4/7 walls = 1 person). and the amount that one person gets done in one minute is 4/(7*36)=4/252=1/63 due to that, assuming that everyone works at the same rate, they do 1/36th of the work in 1/36th of the time. Since we need to find how long it takes for 9 people to paint 7 walls, we can start by getting the amount of walls done per minute for 9 people - since 1 person is 1/63, we can multiply that by 9 to get 9/63=1/7. Next, we have to figure out how many minutes (1/7ths of walls) it will take to get to 7 walls - to find that, we can divide 7 by 1/7 to get 
(7/1)/(1/7)=(7*7)/1=49

Maria, bill, and change sent a total of 71 text messages during the weekend. change sent 2 times as many messages as bill. maria sent 7 more messages than bill. how many messages did they each send?

Answers

Alright, we're dealing with a few values here, so let's give them some labels to save us some trouble down the road. We'll call the number of messages sent by Maria m, the number sent by Bill b and the number sent by Change (is that a real name?) c. We don't know exactly what each number is, but let's take a look at what information they do give us.

Change sent 2 times as many messages as Bill, or, using our variable for Change and Bill:

[tex]c=2b[/tex]

We're also given that Maria sent 7 messages more than Bill, which we can represent with:

[tex]m=b+7[/tex]

Notice that m and c are both in terms of b. We can use this for our next step. We're given at the beginning that together, Maria, Bill, and Change sent 71 messages over the weekend. As an equation using all of our variables, this translates to:

[tex]m+b+c=71[/tex]

Since and are both in terms of b, we can substitute those expressions in and solve for b:

[tex](b+7)+b+2b=71\\ b+7+b+2b=71\\ 7+4b=71\\ 4b=64\\ b=16[/tex]

Now that know that Bill sent 16 texts, we can find the numbers for Change and Maria:

[tex]m=b+7=16+7=23\\ c=2b=2(16)=32[/tex]

So, Bill sent 16 texts, Maria sent 23, and Change sent 32.

If your bank charges an out-of-network service fee of $3.00, and you withdraw $20 from each of three out-of-network atms, how much money in total will be removed from your account?
a. $60
b. $63
c. $69
d. $120

Answers

The amount of the money that is in total removed from the account would be $69.

As per the question, the bank charges an out-of-network service fee of $3.00, and you withdraw $20 from each of three out-of-network ATMs, how much money in total will be removed from your account is to be determined.

What is arithmetic?

In mathematics, it deals with numbers of operations according to the statements. There are four major arithmetic operators, addition, subtraction, multiplication and division,

Here,
Amount withdrew from the ATM three times,
= 3 × 20
= $60
The total service fee charged on out of network 3 times
= 3 × 3
= $9

Now, total money withdrew from the account = 60 + 9 = $69

Thus, the amount of money that is in total removed from the account would be $69.

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Final answer:

The total amount of money that will be removed from your account is $9.00.

Explanation:

To find the total amount of money that will be removed from your account, you need to multiply the out-of-network service fee by the number of withdrawals you made. In this case, the out-of-network service fee is $3.00 and you made three withdrawals. So, the total amount of money that will be removed from your account is $3.00 x 3 = $9.00.

Two times antonio's age plus three times sarah's age equals 34. Sarah's age is also 5 times antonio's age. how old is sarah

Answers

Sarah's 10 years old.
Antonio's 2 years old.

2 x 2 = 4
10 x 3 = 30
4 + 30 = 34

2 x 5 = 10
asnwer: 10
hope this helps:D

plz gibe brainiest

The area of the conference table in Mr. Nathan’s office must be no more than 175 ft2. If the length of the table is 18 ft more than the width, x, which interval can be the possible widths?

Answers

The answer is  0 < x ≤ 7 

First, we know that width =  x
Which means that length = x +18

So, the possible equation for the Table's area is

X (X + 18)  ≤ 175

X^2 + 18x - 175  ≤ 0

Next, we need to calculate is by using complete square method
x^2 + 18x + 81 ≤ 175 + 81

(x + 9)^2 ≤ 256

|x + 9| ≤ sqrt(256)

|x + 9| ≤ +-16

-16 ≤ x + 9 ≤ 16

-16 - 9 ≤ x ≤ 16 - 9

-25 ≤ x ≤ 7

Since the width couldn't be negative, we can change -25 with 0,

so it become
 0 < x ≤ 7 

Zoe, Latoya, Christina, and Rhoda each used a different method to verify that
-2(3x - 12) = -6x + 24


Whose method can be used to verify that the distributive property was correctly applied to the expression?
A.) Zoe's method
B.) Latoy's Method
C.) Christina's Method
D.) Rhoda's Method

Answers

Rhoda : sub same values of x into both expressions. The expressions are equivalent if the values of the expressions are equal.

Answer:

D) Rhoda's Method

Step-by-step explanation:

-2(3x - 12)

Using the distributive property a(b - c) = ab - ac

-2(3x -12) = -2(3x) -2(-12)

= -6x + 24

Which means-2(3x - 12) and -6x + 24 are equal.

To check this, we have to substitute the same x value for both the expression and evaluate them.

Both expression will have the same value.

Therefore, Rhoda is correct.

Thank you.

You are planning to volunteer at a zoo that is 60 miles from your home. you can either take stephanie's car, which gets 20 miles to the gallon

Answers

there is missing information
stephanie's car would require 3 gallons of gasoline to get to the zoo

If you are using this figure to prove the isosceles triangle theorem which of the following would be the best strategy

Answers

If two sides of a triangle are congruent , then the angles opposite to these sides are congruent.

 

∠P≅∠Q∠P≅∠Q

Proof:

Let SS be the midpoint of PQ¯¯¯¯¯PQ¯ .

Join RR and SS .

Since SS is the midpoint of  PQ¯¯¯¯¯PQ¯ , PS¯¯¯¯¯≅QS¯¯¯¯¯PS¯≅QS¯ .

By Reflexive Property ,

RS¯¯¯¯¯≅RS¯¯¯¯¯RS¯≅RS¯

It is given that PR¯¯¯¯¯≅RQ¯¯¯¯¯PR¯≅RQ¯

Therefore, by SSS ,

ΔPRS≅ΔQRSΔPRS≅ΔQRS

Since corresponding parts of congruent triangles are congruent,

∠P≅∠Q∠P≅∠Q

The converse of the Isosceles Triangle Theorem is also true.

If two angles of a triangle are congruent, then the sides opposite those angles are congruent.

If ∠A≅∠B∠A≅∠B , then AC¯¯¯¯¯≅BC¯¯¯¯¯AC¯≅BC¯ .

 

Which binomial is not a devisor of x^3-11x^2+16x+84?

Answers

dividend x3 - 11x2 + 16x + 84 - divisor * x2 x3 - 7x2 remainder - 4x2 + 16x + 84 - divisor * -4x1 - 4x2 + 28x remainder - 12x + 84 - divisor * -12x0 - 12x + 84 remainder 0 Quotient : x2-4x-12 Remainder: 0 Step-1 : Multiply the coefficient of the first term by the constant 1 • -12 = -12 Step-2 : Find two factors of -12 whose sum equals the coefficient of the middle term, which is -4 . -12 + 1 = -11 -6 + 2 = -4 That's it Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above, -6 and 2 x2 - 6x + 2x - 12 Step-4 : Add up the first 2 terms, pulling out like factors : x • (x-6) Add up the last 2 terms, pulling out common factors : 2 • (x-6) Step-5 : Add up the four terms of step 4 : (x+2) • (x-6) Which is the desired factorization Final result : (x + 2) • (x - 6) • (x - 7)

x + 4

Further explanation

Given:

The expression x³ - 11x² + 16x + 84

Question:

Which binomial is not a divisor of x³ - 11x² + 16x + 84?

x + 2x + 4x - 6x - 7

The Process:

This is a problem about Remainder Theorem.

If x = a or (x - a) is one of the roots or factors (divisors) of the function f (x), then f(a) = 0.

Let us test one by one of the options available into the polynomial function.

[tex]\boxed{ \ x + 2 \ } \rightarrow \boxed{ \ x = -2 \ }.[/tex]

[tex]\boxed{ \ \rightarrow (-2)^3 - 11(-2)^2 + 16(-2) + 84 = ? \ }[/tex][tex]\boxed{ \ \rightarrow -8 - 44 - 32 + 84 = 0 \ }[/tex]

[tex]\boxed{ \ x + 4 \ } \rightarrow \boxed{ \ x = -4 \ }.[/tex]

[tex]\boxed{ \ \rightarrow (-4)^3 - 11(-4)^2 + 16(-4) + 84 = ? \ }[/tex][tex]\boxed{ \ \rightarrow -64 - 176 - 32 + 84 = -188 \ }[/tex]

[tex]\boxed{ \ x - 6 \ } \rightarrow \boxed{ \ x = 6 \ }.[/tex]

[tex]\boxed{ \ \rightarrow (6)^3 - 11(6)^2 + 16(6) + 84 = ? \ }[/tex][tex]\boxed{ \ \rightarrow 216 - 396 + 96 + 84 = 0 \ }[/tex]

[tex]\boxed{ \ x - 7 \ } \rightarrow \boxed{ \ x = 7 \ }.[/tex]

[tex]\boxed{ \ \rightarrow (7)^3 - 11(7)^2 + 16(7) + 84 = ? \ }[/tex][tex]\boxed{ \ \rightarrow 343 - 539 + 112 + 84 = 0 \ }[/tex]

From the test results above, it was clearly observed that (x + 4) is not a divisor of x³ - 11x² + 16x + 84 because [tex]\boxed{ \ f (-4) \neq  0 \ }[/tex].

- - - - - - - - - -

Alternative Steps

We will use Horner's rule for polynomial division in finding factors as well as divisors.

To begin, let us try x = -2 to see if it is one of the roots of x³ - 11x² + 16x + 84. The complete process can be seen in the attached picture.Since there is no remainder when x³ - 11x² + 16x + 84 is divided by (x + 2), this binomial is a divisor (or a factor).  The quotient is obtained x² - 13x + 42. After factorization, we get (x - 6) dan (x - 7 as factors and also the divisor.Learn moreThe remainder theorem  https://brainly.com/question/9500387A polynomial of the 5th degree with a leading coefficient of 7 and a constant term of 6 https://brainly.com/question/12700460  The product of a binomial and a trinomial is x 3 + 3 x 2 − x + 2 x 2 + 6 x − 2.

One number is three more than twice another, the sum of the numbers is 12. find the two numbers

Answers

The numbers are:  "3" and "9" .
_______________________________________________________
Explanation:
_______________________________________________________
Let "x" represent one of the two (2) numbers.

Let "y" represent the other one of the two (2) numbers.

x = 2y + 3  ;

x + y = 12 .
__________________________
Method 1)
__________________________
x = 12 − y ; 

Plug this into "x" for "2y + 3 = x" ;

→ 2y + 3 = 12 − y ; 

Add "y" to each side of the equation; & subtract "3" from each side of the equation ;

→ 2y + 3 + y − 3 = 12 − y + y − 3 ;

to get:  3y = 9 ;

Divide each side of the equation by "3" ; 
to isolate "y" on one side of the equation; & to solve for "y" ;

             3y / 3 = 9 / 3 ;

               y = 3 .
____________________________
Now:  x = 12 − y ;  Plug in "3" for "y" ; to solve for "x" ;

    →   x = 12 − 3 = 9
____________________________
So;  x = 9,  y = 3 .
____________________________
Method 2) 
____________________________
When we have:
____________________________
x = 2y + 3  ;

x + y = 12 .
____________________________
 →  y = 12 − x ;
_____________________________
Substitute "(12−x)" for "y" in the equation:

" x = 2y + 3 " ;

→ x = 2(12 − x) + 3 ; 
_____________________________________
Note the "distributive property of multiplication" :
_____________________________________
  a(b + c) =  ab + ac ;

  a(b − c) = ab − ac ;
_____________________________________
As such:
_____________________________________
     →  2(12 − x) = 2(12) − 2(x) = 24 − 2x ; 
_____________________________________
So; rewrite:
_____________________________________
        x = 2(12 − x) + 3 ;
as:
_____________________________________
  →  x = 24 − 2x + 3 ;

  →  x = 27 − 2x ;

Add "2x" to each side of the equation:

 →  x + 2x = 27 − 2x + 2x ;

 →  3x = 27 ;

Divide each side of the equation by "3" ;
    to isolate "x" on one side of the equation; & to solve for "x" ;

      3x / 3 = 27 / 3 ;

        x = 9 .
___________________________
Note:  "y = 12 − x" ;  Substitute "9" for "x" ; to solve for "y" ;

→  y = 12 − 9 = 3 ;

→  y = 3 .
__________________________
So,  x = 9 ; and y = 3.
____________________________
The numbers are:  "3" and "9" .
_____________________________
To check our answers:
Let us plug these numbers into the original equations;
   to see if the equations hold true ; (i.e. when, "x = 9" ; and "y = 3"
_____________________________
  → x + y = 12 ; 

   → 9 + 3 =? 12 ?  Yes!
_____________________________
 
   → x = 2y + 3 ;

   → 9 =? 2(3) + 3 ?? ; 

   → 9 =?  6 + 3 ?  Yes!!
_____________________________

If y=1/2 when x=2, find y when x=3, given that y varies directly with x

Answers

[tex]\bf \qquad \qquad \textit{direct proportional variation}\\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby \begin{array}{llll} k=constant\ of\\ \qquad variation \end{array}\\\\ -------------------------------\\\\ \textit{we also know that } \begin{cases} y=\frac{1}{2}\\ x=2 \end{cases}\implies \cfrac{1}{2}=k2\implies \cfrac{1}{4}=k \\\\\\ \boxed{y=\cfrac{1}{4}x} \\\\\\ \textit{when x=3, what is \underline{y}?}\qquad y=\cfrac{1}{4}\cdot 3[/tex]
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