Answer
$(1.5, -6)$
Work Step by Step
RECALL:
The midpoint of $(x_1, y_1)$ and $(x_2, y_2)$ can be found using the midpoint formula
$\text{midpoint}=\left(\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2}\right)$
Use the formula above to obtain:
$\text{midpoint}=\left(\frac{-3+6}{2}, \frac{-4+(-8)}{2}\right)=\left(\frac{3}{2}, \frac{-12}{2}\right)=(1.5, -6)$