# Math Help - When a constant is on top of a function

1. ## When a constant is on top of a function

When a constant is the numerator

For example,
$

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

Can I rewrite it as $z = x(\frac{1}{y+1})$

So that $\frac {\partial z}{\partial y}= 0 + x[- \frac {1}{(y+1)^2}]$

2. Yes. But you don't need to:
$
\frac {\partial z}{\partial y}= \frac {0(y+1)-1(x)}{(y+1)^2}
$