#### Answer

8

#### Work Step by Step

We are given the expression $wy-8x$. We can plug in the given values to solve for the given expression.
$wy-8x=(4)(\frac{1}{2})-8(-\frac{3}{4})=\frac{4\times1}{2}-(-\frac{8\times3}{4})=\frac{4}{2}-(-\frac{24}{4})=2-(-6)=2+6=8$