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