\[\left\{ \begin{matrix} x - y = 5\ \ \ \ \ \\ x + 2y = - 1 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} y = x - 5\ \ \ \ \ \ \\ 2y = - x - 1 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} y = x - 5\ \ \ \ \\ y = - \frac{x}{2} - \frac{1}{2} \\ \end{matrix} \right.\ \]
\[Ответ:(3; - 2).\]