Four times a number, x, plus 3 times a number, y, equals 75. Five times x minus 3 times y equals 6. Find the numbers by setting up a system of linear equations and solving the system using the elimination method.

Answers

Answer 1
X=9 y=13
4x+3y=75;5x−3y=6
Step: Solve4x+3y=75for x:
4x+3y+−3y=75+−3y(Add -3y to both sides)

Related Questions

A truck travels on the highway at a speed of 72 miles per hour. What is the speed of the truck in feet per second

Answers

1 mile = 5280 ft...so 72 miles = (72 * 5280) = 380160 ft
60 seconds in a minute....60 minutes in an hr...(60 *60) = 3600 seconds in an hr.

380160 / 3600 = 105.6 ft per second <==

The speed of the truck in feet per second will be 105.6 ft per second.

What is unit conversion?

To convert any unit into another is called a unit conversion.

In order to convert units, we need to care about their dimensions their dimension should not be changed.

For example conversion of a kilometer to a meter is to multiply by 1000 but meter and kilometer both unit is for distance only.

Another example could be kilo gram to gram.

1 mile = 5280 feet

And

1 hour = 60 minutes

1 hour = 60 × 60 seconds = 3600 seconds

Now

Given the speed of the truck is

⇒ 72 miles/hour

⇒ 72 × 1 mile/1 hour

⇒ 72 ×  5280 feet/3600 seconds

⇒  105.6 feets/second

Hence "The speed of the truck in feet per second will be 105.6 ft per second".

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The area of a triangle varies jointly with the height of the triangle and the length of its base. The area of one triangle is 150 square centimeters when its height is 20 centimeters and its base length is 15 centimeters. What is the area of a triangle having a height of 30 centimeters and a base length of 18 centimeters?

Answers

The area of the triangle is 270 centimeters. The way that I found that out is the equation 30x18/2
Final answer:

The area of the triangle is 270 square centimeters.

Explanation:

To find the area of a triangle, we can use the formula A = (1/2)bh, where A represents the area, b represents the base length, and h represents the height. In this case, we are given the area of one triangle (150 square centimeters) when its height is 20 centimeters and its base length is 15 centimeters. Plugging these values into the formula, we get:

A = (1/2)(15)(20) = 150

Now, we can use this equation to find the area of another triangle with a height of 30 centimeters and a base length of 18 centimeters:

A = (1/2)(18)(30) = 270 square centimeters

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A = Pe^rt

Can you please help me solve for t?
I've tried using logs to isolate it, but I'm not good with logs and I couldn't figure it out.

Answers

That is the formula for solving for continuously compound interest.
You want to solve for time "t".
A = Pe^rt
Dividing both sides by "P"
(A / P) = e^r*t
Taking NATURAL LOGS of both sides:
(the natural log of "e" is 1)
ln (A / P) = ln (e^r*t)
ln (A / P) = r*t*1
ln (A / P) = rate * time
Time = ln (A / P) ÷ rate


-2(5+6m)+16= -90 and then :(?

Answers

Distribute on the left
-10-12m+16=-90

Combine like terms
-12m+6=-90

Subtract 6 from both sides
-12m=-96

Divide both sides by -12
m=8

Final answer: m=8

which choice below represents the correct domain for an exponential growth or decay function?

a. {x | x > 0}
b. {y | y > 0}
c. x= 0
d. {x | x E R}

Answers

D. {x | x E R} because its all real numbers

Carlos Martin received a statement from his bank showing a balance of $56.75 as of March 15. His checkbook shows a balance of $87.37 as of March 20. The bank returned all the cancelled checks but two. One check was for $5.00 and the other was for $13.25. How much did Carlos deposit in his account between March 15 and March 20? A. $125.87 B. $162.37 C. $11.22 D. $48.87

Answers

Choice D is your answer.

Hope this helps :)

Find length of MN such that LN = 5.7 and LM = 1.3 MN= x + 2.1

Answers

Final answer:

To find the length of MN, we can set up an equation using the fact that LN + LM = MN and substitute the given values. Solving for x, the length of MN is found to be 4.9 units.

Explanation:

To find the length of MN, we can use the fact that LN = 5.7 and LM = 1.3. We are also given that MN = x + 2.1. Since LN and LM are known, we can set up an equation using the fact that LN + LM = MN.

LN + LM = MN

5.7 + 1.3 = MN

Then, we can substitute the given value of MN = x + 2.1 into the equation and solve for x.

5.7 + 1.3 = x + 2.1

7 = x + 2.1

x = 7 - 2.1

x = 4.9

Therefore, the length of MN is 4.9 units.

Find equation where line passes through (7,8) and perpendicular to line y=8

Answers

Since in y=8, the slope is 0 (because there is no x) and b is 8 in y=mx+b, we know that the perpendicular line is x=(something) because the perpendicular lines of y=<number> are x=<number> due to that y=<number> equations are strictly horizontal while x=<number> equations are strictly vertical. Since we know that x=<number> has to pass through (7, 8), x =7

What is a factored form of the following expression?

5x squared - 20x

A. 5(x squared - 4)
B. 5(x - 2) squared
C. 5x (x-4)
D. (5x-4)(x+5)

Answers

C: 5x (x-4)
If you were to distribute the 5x to everything in parentheses, you would get 5x squared (5x × 5) and -20x (5x × -4)

Ryan works at the car wash making $5.30 per hour plus tips. Last week Ryan worked 32 hours and earned $403. How much in tips did Ryan make last week?
a. $86.40
b. $148.00
c. $169.60
d. $233.40

Answers

5.30 x 32 = 169.6

403 - 169.6= 233.4

He made $233.40 last week, answer D

Answer:

Option d.

Step-by-step explanation:

Ryan works at the car wash and earns  = $5.30 per hour plus tips.

His earning from 32 hours of work = 32 × 5.30 = $169.60

He total earned = $403.00

Therefore, he earned from tips = $403 - $169.60

                                                  = $233.40

Ryan earned in tips $233.40.

You ask a neighbor to water a sickly plant while you are on vacation. without water the plant will die with probability 0.8. with water it will die with probability 0.5. you are 80 % certain the neighbor will remember to water the plant. you come back from the vacation and the plant is dead. what is the probability that the plant died because neighbor forgot to water it?

Answers

the correct answer should be 20% because u were 80% certain he would remember so that means ur 20% certain he would forget

Please help ASAP : ))))

Trevor went to fill his car up with gas. It costs $2.95 per gallon of gas. Trevor also bought a car wash for $11.25. Trevor's total bill at the gas station was $52.55.

A) Write an equation that represents this situation.

B) How many gallons of gas did Trevor purchase at the gas station?

Answers

B. 18 gallons is the answer
$52.55 - $11.25 = $41.30
 
Trevor spent $41.30 dollars on gas and he bought 14 gallons

A squirrel runs 3.4 meters east and then 6.9 meters south, then another 5.2 meters east what is the distance the squirrel traveled?

Answers

14.15 Just add all of the miles the squirrel ran.
Distance is simply the total amount traveled. 3.4+6.9+5.2=15.5 meters traveled. Displacement would be the distance traveled from the original point, which would be completely different!

Solve for x.
x/2 ≥ −4

x ≥ −8

x ≥ −2

x ≤ −8

x ≤ −2

Solve for t.

−3t ≥ 39



t ≤ 13

t ≤ −13

t ≥ −13

t ≥ 13

Solve for x.

−6 ≥ 10−8x



x ≤ −2

x ≥ −2

x ≤ 2

x ≥ 2

Solve for d.

5+d > 5−d



d > 6

d > 0

d > −10

d < −5

Solve for x.

4(x+) ≤ 4x+3



x ≤ 1

x ≤ 7

no solution

all real numbers

Answers

I think these are the answers. I think you copied a few of the questions wrong.

x ≥ −8
t ≤ −13
x ≤ 2
d > 0
no solution

Number 3. is wrong the correct answer is D.

Suppose a jet travels 60 kilometers in 5 minutes how many kilometers will it travel in 2 hours?in 6 hours ? In 6 hours it will travel?

Answers

In 2 hrs, the jet will travel 1,440 kilometers.

In 6 hrs, the jet will travel 4,320 kilometers.

i love math period.

It is found that in 2 hrs, the jet will travel 1,440 kilometers. And in 6 hrs, the jet will travel 4,320 kilometers.

What is the fundamental principle of multiplication?

Multiplication is the mathematical operation that is used to determine the product of two or more numbers.

We can calculate this using the following steps:

60 kilometers in 5 minutes

x kilometers in 2 hours = 120 minutes

Therefore,

60 ( 120 )= 5  x

x = 60 ( 120 / 5)

x = 1440 kilometers

y kilometers in 6 hours = 360 minutes

60 (360) = 5 y

y = 60 ( 360 / 5)

y = 4320 kilometers

Hence, It is found that in 2 hrs, the jet will travel 1,440 kilometers. And in 6 hrs, the jet will travel 4,320 kilometers.

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What is the equation of the exponential graph shown?

Please help :'(

Answers

The equation of the exponential graph is y = 100(0.5)^x

How to determine the exponential equation?

On the graph, we have the following points

(x,y) = (0,100) and (1,50)

An exponential equation is represented as:

y = ab^x

Where a = y, when x = 0.

This means that

a = 100

So, we have:

y = 100b^x

At the point (1,50), we have:

50 = 100b^1

Evaluate

50 = 100b

Divide both sides by 100

b = 0.5

Substitute b = 0.5 in y = 100b^x

y = 100(0.5)^x

Hence, the equation of the exponential graph is y = 100(0.5)^x

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Identify three solutions of the graph shown. Please help

Answers

From the graph, we can see that the graph crosses the x-axis at the point (1.5, 0) the graph also passes through point (1, 1) and the graph crosses the y-axis at the point (0, 3).

Therefore, points (1.5, 0), (1, 1) and (0, 3) are some of the solutions of the graph.

Can someone please help me? ill give brainliest for correct answer!

The graph below shows the number of spoons arranged on different numbers of tables in a room:

What does the point (1, 10) on the graph represent?

The ratio of spoons to tables is 11:1.
There are 10 spoons for every 1 table.
The ratio of tables to spoons is 11:1.
There are 10 tables for every 1 spoon.

Answers

There are 10 spoons for every 1 table


hope this helps

because it is 1:10, 2:20, etc

so it is 10 for each
(1,10)...represents: there are 10 spoons for every 1 table

Does 3.2 - 4d=2.3d+3 no solution or identity

Answers

d=0.04286 is the answer

The solution of expression is,

⇒ d = 5/16

We have to given that,

An expression is,

⇒ 3.2 - 4d = 2.3d + 3

Now, We can simplify the expression for solution as,

⇒ 3.2 - 4d = 2.3d + 3

Add 4d both side,

⇒ 3.2 - 4d + 4d = 2.3d + 3 + 4d

⇒ 3.2 = 6.3d + 3

Subtract 3 both side,

⇒ 3.2 - 3 = 6.3d

⇒ 0.2 = 6.3d

⇒ 6.3d = 0.2

Divide 6.3 both side,

⇒ d = 0.2/6.4

⇒ d = 20/64

⇒ d = 5/16

Thus, The solution of the expression is, d = 5/16

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What two things hindered the growth of Spanish colonies??

Answers

There were two main things which negatively impacted the growth of Spanish colonies. The first issue involved the Spanish settlers experiencing difficult relations with the Indians who lived there first. The second problem centered on miner's inability to find either gold or silver deposits that would lure other people to settle there.

Final answer:

The growth of Spanish colonies was hindered by the vast distance between the colonies and Spain, restrictive economic policies, environmental depletion, exploitation of resources, and conflict. The decline in indigenous populations and internal governmental strife also played significant roles.

Explanation:

Factors Hindering the Growth of Spanish Colonies

The growth of the Spanish colonies was hindered by several factors after the initial period of discovery and conquest. First, the distance and the expanse of the Atlantic Ocean created significant challenges for effective communication and administration between the colonies and Spain. Second, the rigid economic policies imposed by the Spanish Crown, which restricted colonial trade to raw materials to Spain and finished goods from Spain, limited economic diversification and local development.

Additionally, environmental depletion and exploitation of resources, alongside harsh treatment and violence against Indigenous populations, led to a decrease in the native labor force. As a substitute, the Spanish were compelled to import African slaves, which transitioned the labor system but did not solve the inherent problems of the colonial economy.

The desire for precious metals, such as silver and gold, and the competition for conversion to Catholicism often came at a substantial human cost, leading to significant loss of indigenous life due to disease and conflicts. Revolts and uprisings, such as the Pueblo Revolt, as well as internal government conflicts and higher tax burdens on the Criollos were also among the contributing factors that hindered the growth and stability of Spanish colonies.

Suppose that during a speech, (x – 4)2 students protested. If 36 students protested, what are the possible values of x?

Answers

The expression will become;
(x - 4)² = 36
Now by using the formula;
(a-b)² = a² -2ab + b²
(x - 4)² = x² - 2(x)(4) + 4² = x² - 8x +16
Now the expression will be;
x² - 8x + 16 = 36
x² - 8x + 16 - 36 = 0
x² - 8x - 20 = 0
Now by using factorization method;
x² -10x + 2x -20 = 0   ,    -10 + 2 = 8 and -10 x 2 = -20
x(x-10) + 2 (x - 10) = 0
(x -10) (x +2) = 0
Now either x - 10 = 0 or x+2 = 0
it means x = 10 or x -2
So, the possible values of x are 10 and -2.

the expression 2x+50 represents the elevation above sea level, in meters, of a rock climber after x minutes of climbing.

Which is the rock climbers initial height above sea level?

Enter your answer in the box.

Answers

x=0, The answer is 50.
Answer:

The rock climbers initial height above sea level is:

                                 50 meters.

Step-by-step explanation:

The expression which is used to represent the elevation above sea level, in meters, of a rock climber after x minutes of climbing is given by:

                                     2x+50

Now, we are asked to find the rock climbers initial height above sea level i.e. we are asked to find the value of the expression when x=0.

Hence, when x=0 we  have:

2x+50=2×0+50

          = 50

Hence, the answer is: 50 meters.

25 POINTS!!!!!!!!!!!!!!!!!!!!!!

Determine the graph of (f-g)(x) when f(x)=1/x and g(x)=sqrt(x).

The answer choices are in order A B C D.

Answers

this makes a curved line in the 1st quadrant so A is the answer

Which line is horizontal?   A. y = 2   B. y = 2x   C. y = −2x   D. y = x

Answers

learn this..
HOY -- horizontal line, 0 slope, represented by y = a number
VUX-- vertical line, undefined slope, represented by x = a number

ur horizontal line is : y = 2

Is (1,-4) a solution to the equation y=-2x?
Yes or no? Please help /:

Answers

No it is not, the solution would need to be (2,-4) in order to satisfy the equation y = -2x -- like so -4 = -2(2)

-4 = -4, otherwise the equation won't be satisfied.
A solution means that it will make the statement true. Let substitute this in:

y = -2x
-4 = -2(1)
-4 = -2

-4 obviously isn't equal to -2, so it is not a solution to the equation.

Hope this helps!

What is the value of the expression when a = 4 and b = 2? open study?

Answers

I'm not sure but I think the value that is substituted is 4.

Replace all occurrences of a with the solution found by solving the last equation for a. So my answer would be 4 for the value that is substituted. I hope I was of some use to you.

Suppose you buy two sweaters. each sweater costs the same amount. the amount of money you spend varies directly with the number of sweaters you buy. if you spent $37.50 for two sweaters, what is the constant of variation?

Answers

the constant of the variation is the price of the sweater. In this case, it will be $37.50÷2 = $18.75.
Thus, the constant of variation is 18.75

Answer with Step-by-step explanation:

We spent $37.50 for two sweaters.

Each sweater costs the same amount.

Cost of each sweater=$37.50/2

                                  =$18.75

The amount of money you spend varies directly with the number of sweaters you buy.

We have to find the constant of variation.

Here, cost of each sweater is the constant of variation.

Hence, constant of variation is:

$18.75

It is sometimes possible to write two inequalities as a inequality.

Answers

Hi!

Yes, it is. When we have one inequality composed of two inequalities, we call this a double inequality. 

A double inequality would look something like -5 < 4x < 10.

Hopefully, this helps! =)
Final answer:

In mathematics, it is common to combine two inequalities into a single compound inequality to indicate a range for a variable. Inequalities are also used in describing alternative hypotheses in statistics and conversions between measurement systems.

Explanation:

It is indeed sometimes possible to represent two separate inequalities as a single compound inequality in mathematics. This technique is often used to indicate that a value lies within a certain range. For instance, to show that a number x is greater than 1 but less than 3, we can write two inequalities: x > 1 and x < 3. These can be combined into a single compound inequality 1 < x < 3.

Inequalities are often used in various mathematical contexts, such as solving equations, graphing regions on a coordinate plane, or expressing ranges. Furthermore, in statistics, the alternative hypothesis is typically denoted using inequality symbols (≠, >, or <), showing a predicted difference or relationship.

To express equivalences between different measurement systems, a common approach is to use 1 as an exact value on one side of the equation, with the other side being inexact. Mathematically, you can rearrange equations for convenience into formats showing direct or indirect proportionalities, simplifying complex relationships into more manageable forms.


During the month of February, Fabulous Feet Shoe Mart sold 30 pairs of red loafers. After an ad campaign to boost sales, they sold 39 pairs in March. Find the percent of increase in sales.

35%

30%

23%

18%

Answers

percent increase = (new number - original number) / (original number) * 100
                           = (39 - 30) / 30......* 100
                           = 9/30 * 100
                           = 0.3 * 100
                           = 30% increase <===

Deangelo has $7 worth of dimes and quarters in a jar. He has 7 more quarters than dimes. How many of each coin does he have?

Answers

he has 22 quarters and 15 dimes
hope it helps

0.10d +0.25q = 7.00

 multiply everything by 100 to get rid of decimals

q = d+7 ( 7 more quarters than dimes)


10d +25(d+7) = 700

10d + 25d +175 = 700

35d +175 = 700

 subtract 175 from each side

35d =525

d = 525 / 35 = 15

 

15 dimes

 quarters = 15 +7 = 22




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