Answer
$\color{blue}{y=2}$
Work Step by Step
RECALL:
A horizontal line has a slope of zero and an equation of the form $y=k$ where $k$ is the y-intercept.
All points on the line have $y=k$.
The given line is horizontal and contains the point $(-3, 2)$.
This means that all points on the line have $y=2$, and that the equation of the line itself is $y=2$.
Thus, the equation of the line is:
$\color{blue}{y=2}$
