Решите систему уравнений: 3x+7y=-4, 5x-8y=13.

\[\left\{ \begin{matrix} 3x + 7y = - 4\ \ \ | \cdot 5 \\ 5x - 8y = 13\ \ \ \ | \cdot 3 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ \ \ }\]

\[\left\{ \begin{matrix} 15x + 35y = - 20 \\ 15x - 24y = 39\ \ \ \\ \end{matrix} - \right.\ \text{\ \ \ \ \ }\]

\[\left\{ \begin{matrix} 59y = - 59\ \ \ \\ x = \frac{13 + 8y}{5} \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ }\]

\[\left\{ \begin{matrix} y = - 1 \\ x = 1\ \ \ \ \\ \end{matrix} \right.\ \]

\[Ответ:(1;\ - 1).\]