Answer
The graph is shown below.
Work Step by Step
The given inequality is
$y\leq5$
Graph $y=5$. Use a solid line because the inequality symbol is $ \leq$.
Test $(0,0)$.
$\Rightarrow y\leq5$
$\Rightarrow 0\leq5$
Hence, $(0,0)$ is a solution, shade the half-plane that contains $(0,0)$.