Find the Solution Set for the System of Linear Inequalities $\begin{array} { l } x - y \leq 3 \\x + 2 y \leq 6\end{array}$

Find the solution set for the system of linear inequalities.
$\begin{array} { l } x - y \leq 3 \\x + 2 y \leq 6\end{array}$