Answer
$y\leq -3$
The graph is shown below.
Work Step by Step
The given inequality is
$\Rightarrow 3y\leq -9$
Divide each side by $3$.
$\Rightarrow \frac{3y}{3}\leq \frac{-9}{3}$
Simplify.
$\Rightarrow y\leq -3$
Hence, the solution is $y\leq -3$.
Use a close circle because $-3$ is a solution.
Shade the number line on the left side.
