Answer
$ a\leq 9$
The graph is shown below.
Work Step by Step
The given inequality is
$\Rightarrow 2a-5\leq 13$
Add $5$ to each side.
$\Rightarrow 2a-5+5\leq 13+5$
Simplify.
$\Rightarrow 2a\leq 18$
Divide each side by $2$.
$\Rightarrow \frac{2a}{2}\leq \frac{18}{2}$
Simplify.
$\Rightarrow a\leq 9$
Hence, the solution is $ a\leq 9$.
Use a close circle because $9$ is a solution.
Shade the number line on the left side.
