\[\left\{ \begin{matrix} x^{2} + y^{2} \leq 9 \\ y - x \leq 1\ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ }\left\{ \begin{matrix} x^{2} + y^{2} \leq 9 \\ y \leq 1 + x\ \ \ \ \\ \end{matrix} \right.\ \ \]