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Algebra 1 : Algebraic Functions

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Example Questions

Example Question #122 : Sat Subject Test In Math I

If is directly proportional to and when a=24 at b=12 , what is the value of the constant of proportionality?

Possible Answers:

2.5

1.5

Correct answer:

Explanation:

The general formula for direct proportionality is

a=kb

where is the proportionality constant. To find the value of this , we plug in a=24 and b=12

24=12k

Solve for by dividing both sides by 12

$\frac{24}{12}=\frac{12k}{12}$

2=k

So k=2 .

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Example Question #123 : Sat Subject Test In Math I

The amount of money you earn is directly proportional to the nunber of hours you worked. On the first day, you earned $32 by working 4 hours. On the second day, how many hours do you need to work to earn $48.

Possible Answers:

Correct answer:

Explanation:

The general formula for direct proportionality is

M=kh

where is how much money you earned, is the proportionality constant, and is the number of hours worked.

Before we can figure out how many hours you need to work to earn $48, we need to find the value of . It is given that you earned $32 by working 4 hours. Plug these values into the formula

32=4k

Solve for by dividing both sides by 4.

$\frac{32}{4}=\frac{4k}{4}$

8=k

So k=8 . We can use this to find out the hours you need to work to earn $48. With k=8 , we have

M=8h

Plug in $48.

48=8h

Divide both sides by 8

$\frac{48}{8}=\frac{8h}{8}$

6=h

So you will need to work 6 hours to earn $48.

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Example Question #32 : Proportionalities

The volume of a fixed mass of gas varies inversely as the atmospheric pressure, as measured in millibars, acting on it, and directly as the temperature, as measured in kelvins, acting on it.

A balloon is filled to a capacity of exactly 100 cubic meters at a time at which the temperature is 310 kelvins and the atmospheric pressure is 1,020 millibars. The balloon is released, and an hour later, the balloon is subject to a pressure of 900 millibars and a temperature of 290 kelvins. To the nearest cubic meter, what is the new volume of the balloon?

Possible Answers:

$100 \textrm{ m}^{3}$

$121 \textrm{ m}^{3}$

$83 \textrm{ m}^{3}$

$106 \textrm{ m}^{3}$

$94 \textrm{ m}^{3}$

Correct answer:

$106 \textrm{ m}^{3}$

Explanation:

If V,P,T are the volume, pressure, and temperature, then the variation equation will be, for some constant of variation ,

$V = \frac{KT}{P}$

To calculate , substitute V = 100, T = 310, P = 1,020 :

$100 = \frac{K \cdot 310}{1,020}$

$\frac{K \cdot 310}{1,020} \cdot \frac{1,020}{310} = 100 \cdot \frac{1,020}{310}$

K = 329.03

The variation equation is

$V = \frac{329.03 T}{P}$

so substitute T =290, P = 900 and solve for .

$V = \frac{329.03 \cdot 290}{900} \approx 106 \textrm{ m}^{3}$

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Example Question #3 : Setting Up Equations

The monthly cost to insure your cars varies directly with the number of cars you own. Right now, you are paying $420 per month to insure 3 cars, but you plan to get 2 more cars, so that you will own 5 cars. How much does it cost to insure 5 cars monthly?

Possible Answers:

$\$748$

$\$810$

$\$700$

$\$633$

$\$390$

Correct answer:

$\$700$

Explanation:

The statement, 'The monthly costly to insure your cars varies directly with the number of cars you own' can be mathematically expressed as M=kC . M is the monthly cost, C is the number of cars owned, and k is the constant of variation.

Given that it costs $420 a month to insure 3 cars, we can find the k-value.

420=k * 3

Divide both sides by 3.

k=140

Now, we have the mathematical relationship.

M=140C

Finding how much it costs to insure 5 cars can be found by substituting 5 for C and solving for M.

M=140(5)

M=700

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Example Question #141 : Algebraic Functions

Does the equation below represent a direct variation? If it does, find the constant of variation.

7y = 2x

Possible Answers:

Yes, $y= \frac{7}{2}x, \frac{7}{2}$

No, $y = \frac{1}{14}x, \frac{1}{14}$

No, $\frac{7}{2}y = x$ , 1

Yes, $y = \frac{2}{7}x$ $, \frac{2}{7}$

Yes, y = 14x, 14

Correct answer:

Yes, $y = \frac{2}{7}x$ $, \frac{2}{7}$

Explanation:

Direct Variation is a relationship that can be represented by a function in the form

y = kx , where $k \neq 0$

is the constant of variation for a direct variation. is the coefficient of .

7y = 2x

$y = \frac{2}{7}x$

The equation is in the form y = kx , so the equation is a direct variation.

The constant of variation or is $\frac{2}{7}$

Therefore, the answer is,

Yes it is a direct variation, $y = \frac{2}{7}x,$ with a direct variation of $\frac{2}{7}$

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Example Question #142 : Algebraic Functions

Suppose x=24 and y=4 , and that is in direct proportion with . What is the value of proportionality?

Possible Answers:

$\frac{1}{6}$

5.5

Correct answer:

Explanation:

The general formula for direct proportionality is

x=ky

where is our constant of proportionality. From here we can plug in the relevant values for and to get

24=4k

Solving for requires that we divide both sides of the equation by , yielding

k=6

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Example Question #5 : How To Find Direct Variation

The cost of a catering company varies directly with the number of people attending. If the cost is $100 when 20 people attend the party, find the constant of variation.

Possible Answers:

k=5

k=8

k=40

k=2000

Correct answer:

k=5

Explanation:

Because the cost varies directly with the number of people attending, we have the equation

C=kN

Where is the cost and is the number of people attending.

We solve for , the constant of variation, by plugging in C=100 and N=20 .

100=k(20)

And by dividing by 20 on both sides

$\frac{100}{20}=\frac{k(20) }{20}$

Yields

k=5

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Example Question #211 : Functions And Lines

The amount of money Billy earns is directly proportional to his hours worked. Suppose he earns $\$12$ every eight hours of work. What is the minimum hours Billy must work in order to exceed $\$100$ ? Round to the nearest integer.

Possible Answers:

150

Correct answer:

Explanation:

Write the formula for direct proportionality.

y=kx

Let:

$x=\textup{hours worked}$

$y= \textup{earnings}$

Substitute twelve dollars and eight hours into this equation to solve for .

$\$12=k(8)$

Divide by eight on both sides.

$k=\frac{12}{8} = \frac{3}{2}$

Substitute back into the formula.

$y=\frac{3}{2}x$

To find out the minimum number of hours Billy must work to make $\$100$ , substitute $\$100$ into and solve for .

$\$100=\frac{3}{2}x$

Multiply by two thirds on both sides.

$100\cdot \frac{2}{3}=\frac{3}{2}x \cdot \frac{2}{3}$

Simplify both sides.

$x=\frac{200}{3} = 66.\overline{6}$

Billy must work at least hours to earn as much required.

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Example Question #1 : How To Find Inverse Variation

Find the inverse of the following function:

$f(x) = x^{2}-3$

Possible Answers:

$x^{2} -3$

None because the given function is not one-to-one.

$\sqrt{x+3}$

$x^{2} +3$

$-\sqrt{x+3}$

Correct answer:

None because the given function is not one-to-one.

Explanation:

$f\left ( x \right ) = x^{2}-3$

which is the same as

$y = x^{2}-3$

If we solve for we get

$x^{2} = y +3$

Taking the square root of both sides gives us the following:

$x = \pm \sqrt{y+3}$

Interchanging and gives us

$y = \pm \sqrt{x + 3}$

Which is not one-to-one and therefore not a function.

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Example Question #1 : How To Find Inverse Variation

Given

$f\left ( x \right ) = 2x+3$

and

$g\left ( x \right ) = \frac{x-3}{2}$ .

Find $f\left ( g\left ( x \right ) \right )$ .

Possible Answers:

$g\left ( x \right )$

$f\left ( x \right )$

Correct answer:

Explanation:

Starting with $f\left ( x \right ) = 2x+3$

Replace with $g\left ( x \right )$ .

We get the following:

$2\left ( \frac{x-3}{2} \right )+3=x-3+3$

Which is equal to .

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Algebra 1 : Algebraic Functions

Study concepts, example questions & explanations for Algebra 1

All Algebra 1 Resources

Example Questions

Example Question #122 : Sat Subject Test In Math I

Example Question #123 : Sat Subject Test In Math I

Example Question #32 : Proportionalities

Example Question #3 : Setting Up Equations

Example Question #141 : Algebraic Functions

Example Question #142 : Algebraic Functions

Example Question #5 : How To Find Direct Variation

Example Question #211 : Functions And Lines

Example Question #1 : How To Find Inverse Variation

Example Question #1 : How To Find Inverse Variation

All Algebra 1 Resources

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