Answer
$y=-8$
Work Step by Step
Horizontal lines have 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 $(
2,-8
)$ is
\begin{array}{l}
y-(-8)=0(x-2)
\\\\
y+8=0
\\\\
y=-8
.\end{array}