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Algebra 1 : Functions and Lines

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10 Diagnostic Tests 557 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

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Example Question #26 : How To Find Inverse Variation

Find the inverse of y=2x+9 .

Possible Answers:

$y=\frac{1}{2}x-\frac{9}{2}$

y=-2x-9

y=-2x+9

$y=\frac{1}{2}x+\frac{9}{2}$

$y=-\frac{1}{2}x+\frac{9}{2}$

Correct answer:

$y=\frac{1}{2}x-\frac{9}{2}$

Explanation:

Interchange the x and y variables.

x=2y+9

Subtract nine from both sides.

x-9=2y+9-9

Simplify both sides.

x-9=2y

Divide by two on both sides.

$\frac{x-9}{2}=\frac{2y}{2}$

Simplify the fractions.

$\frac{1}{2}x-\frac{9}{2}=y$

The inverse is: $y=\frac{1}{2}x-\frac{9}{2}$

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Example Question #27 : How To Find Inverse Variation

The cost to go on a field trip varies inversely with the number of people attending the trip. If it costs $10 to go on the trip when 3 people are attending, how much would it cost if 15 people are attending?

Possible Answers:

$50

Correct answer:

Explanation:

Because the cost varies inversely with the number of people attending, the formula is

$C=\frac{k}{N}$

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

We first solve for by plugging in C=10 and N=3 .

$10=\frac{k}{3}$

$10*3=\frac{k}{3}*3$

30=k

We then evaluate when N=15

$C=\frac{30}{15}$

C=2

Therefore the cost is

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Example Question #28 : How To Find Inverse Variation

Find the inverse: y=2x+8

Possible Answers:

$y=\frac{1}{2}x-8$

$y=\frac{1}{2}x-4$

$y=\frac{1}{2}x+4$

$y=-\frac{1}{2}x+4$

$y=-\frac{1}{2}x-4$

Correct answer:

$y=\frac{1}{2}x-4$

Explanation:

Interchange the x and y variables.

x=2y+8

Solve for y. Subtract eight on both sides.

x-8=2y+8-8

x-8=2y

Divide by two on both sides.

$\frac{x-8}{2}=\frac{2y}{2}$

Simplify both sides.

$\frac{x-8}{2}=y$

The answer is: $y=\frac{1}{2}x-4$

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Example Question #29 : How To Find Inverse Variation

Find the inverse of: y=9x-1

Possible Answers:

$y=-\frac{1}{9}x+\frac{1}{9}$

$y=\frac{1}{9}x+\frac{1}{9}$

y=-9x-1

$y=\frac{1}{9}x-\frac{1}{9}$

y=-9x+1

Correct answer:

$y=\frac{1}{9}x+\frac{1}{9}$

Explanation:

Interchange the x and y variables.

x=9y-1

Solve for y. Add 1 on both sides and simplify.

x+1=9y-1+1

x+1=9y

Divide by nine on both sides.

The answer is: $y=\frac{1}{9}x+\frac{1}{9}$

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Example Question #30 : How To Find Inverse Variation

Find the inverse of: f(x)= 2x-18

Possible Answers:

$y=\frac{1}{2}x -18$

$y=-\frac{1}{2}x -18$

$y=\frac{1}{2}x +9$

$y=-\frac{1}{2}x -9$

$y=\frac{1}{2}x -9$

Correct answer:

$y=\frac{1}{2}x +9$

Explanation:

Replace the f(x) term with .

y= 2x-18

Interchange the and variables.

x=2y-18

Solve for . Add on both sides.

x+18=2y-18+18

Simplify both sides.

2y=x+18

Divide by two on both sides.

$\frac{2y}{2}=\frac{x+18}{2}$

Simplify both sides.

The answer is: $y=\frac{1}{2}x +9$

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Example Question #31 : How To Find Inverse Variation

Find the inverse of: y=6x+5

Possible Answers:

$y=- \frac{1}{6}x-\frac{5}{6}$

$y=- \frac{1}{6}x+\frac{5}{6}$

$y= \frac{1}{6}x-\frac{5}{6}$

$y= \frac{1}{6}x+5$

y=-6x+5

Correct answer:

$y= \frac{1}{6}x-\frac{5}{6}$

Explanation:

Interchange the x and y-variables.

x=6y+5

Solve for y. Subtract five from both sides.

x-5=6y+5-5

Simplify the right side.

x-5=6y

Divide by six on both sides.

$\frac{x-5}{6}=\frac{6y}{6}$

Simplify both sides.

The answer is: $y= \frac{1}{6}x-\frac{5}{6}$

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Example Question #171 : Algebraic Functions

Find the inverse of: y=4x-6

Possible Answers:

$y=-4x+\frac{3}{2}$

$y=-\frac{1}{4}x+\frac{3}{2}$

$y=-4x-\frac{3}{2}$

$y=-\frac{1}{4}x-\frac{3}{2}$

$y=\frac{1}{4}x+\frac{3}{2}$

Correct answer:

$y=\frac{1}{4}x+\frac{3}{2}$

Explanation:

To find the inverse, interchange the x and y-variables.

x=4y-6

Solve for y. Add 6 on both sides of the equation.

x+6=4y-6+6

Simplify the right side.

x+6=4y

Divide by four on both sides.

$\frac{x+6}{4}=\frac{4y}{4}$

Simplify both sides.

$y=\frac{1}{4}x+\frac{6}{4}$

Simplify the y-intercept.

The answer is: $y=\frac{1}{4}x+\frac{3}{2}$

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Algebra 1 : Functions and Lines

Study concepts, example questions & explanations for Algebra 1

All Algebra 1 Resources

Example Questions

Example Question #26 : How To Find Inverse Variation

Example Question #27 : How To Find Inverse Variation

Example Question #28 : How To Find Inverse Variation

Example Question #29 : How To Find Inverse Variation

Example Question #30 : How To Find Inverse Variation

Example Question #31 : How To Find Inverse Variation

Example Question #171 : Algebraic Functions

All Algebra 1 Resources

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