# How do you combine 4/y+5/-y?

Jul 11, 2016

$\frac{1}{-} y$

#### Explanation:

First, we need to get common denominators. We can do that by multiplying the first fraction by $- 1$.

$\frac{4 \times - 1}{y \times - 1} + \frac{5}{-} y$

$\frac{- 4}{-} y + \frac{5}{-} y$

Now we have common denominators. We can go ahead and add the fractions.

$\frac{- 4 + 5}{-} y$

$\frac{1}{-} y$