Find $y - x$ where $y = -\frac{11}{16}$ and $x = \frac{18}{32}$.

Simplify $x$:

$x = \frac{18}{32} = \frac{9}{16}$

Now compute $y - x$:

$y - x = -\frac{11}{16} - \frac{9}{16} = \frac{-11 - 9}{16} = \frac{-20}{16} = -\frac{5}{4}$