## Prealgebra (7th Edition)

$y^2$
$\frac{xy^3}{z}\times\frac{z}{xy}$ $\longrightarrow$ multiply numerators and denominators =$\frac{/\!\!x/\!\!yy^2/\!\!z}{/\!\!z/\!\!x/\!\!y}$ $\longrightarrow$ cancel common factors =$y^2$