# Chapter 11 - Rational Expressions and Functions - Chapter Review - 11-6 Inverse Variation - Page 706: 29

$y = \frac{-18}{x}$ or $xy = -18$

#### Work Step by Step

Our equation for an inverse variation is $y = \frac{k}{x}$ or $xy = k$. We will use the second form of the equation to solve for k. $2\times-9 = k$ $-18 = k$ $k = -18$ Therefore, our equation for the inverse variation is $y = \frac{-18}{x}$ or $xy = -18$

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