GRE Math : How to find inverse variation

Study concepts, example questions & explanations for GRE Math

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Example Questions

Example Question #1 :How To Find Inverse Variation

Find the inverse equation of:

Possible Answers:

Correct answer:

Explanation:

To solve for an inverse, we switch x and y and solve for y. Doing so yields:

Example Question #3 :How To Find Inverse Variation

Find the inverse equation of

Possible Answers:

Correct answer:

Explanation:

1. Switch theandvariables in the above equation.

2. Solve for:

Example Question #2661 :Sat Mathematics

When,

When,

Ifvaries inversely with, what is the value ofwhen?

Possible Answers:

Correct answer:

Explanation:

Ifvaries inversely with,

1. Using any of the twocombinations given, solve for:

Using:

2. Use your new equationand solve when:

Example Question #2662 :Sat Mathematics

x

y

Ifvaries inversely with, what is the value of?

Possible Answers:

Correct answer:

Explanation:

An inverse variation is a function in the form:or, whereis not equal to 0.

Substitute eachin

Therefore, the constant of variation,, must equal 24. Ifvaries inversely as,must equal 24. Solve for

Example Question #3 :Algebraic Fractions

andvary inversely. When,。When,。什么相等时n?

Possible Answers:

Correct answer:

Explanation:

Because we knowandvary inversely, we know thatfor some

When,

When,

Therefore, when, we haveso

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