Answer
Refer to the image below for the graph.
Work Step by Step
Divide 3 on both sides of the equation to obtain:
$y=\frac{18}{3}
\\y=6$
RECALL:
The graph of the equation $y=k$ is a horizontal line.
Every point on the line has the same y-value.
Thus, to graph $y=6$, you can plot the points (0, 6), (-3, 6), and (3, 6).
Then, connect them using a line.
