\[\left\{ \begin{matrix} x^{2} + y^{2} \leq 16 \\ x + y \geq - 2\ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ }\left\{ \begin{matrix} x^{2} + y^{2} \leq 16 \\ y \geq - 2 - x\ \ \ \\ \end{matrix} \right.\ \ \]