Answer
-$\frac{a}{b}$ = $\frac{-a}{b}$ = $\frac{a}{-b}$
Work Step by Step
We know (-1)$\frac{a}{b}$ = $\frac{-a}{b}$.
Also,
$\frac{-a}{b}$ = $\frac{a}{-b}$.
To see this, cross multiply.
(-a)(-b) = (a)(b)?
ab = ab ....... (Since (-1)(-1) = 1).