Answer
$y=-5$
Work Step by Step
A line parallel to $y=8$ has a slope of $0$. Using $y-y_1=m(x-x_1)$ or the Point-Slope Form, the equation of the line with slope $0$ and passing through $(-2,-5)$ is
\begin{array}{l}
y-(-5)=0(x-(-2))
\\\\
y+5=0
\\\\
y=-5
.\end{array}