\[\left\{ \begin{matrix} m - 3n = 8\ \ \ \ \ \\ 2m - 3n = 10 \\ \end{matrix} \right.\ \text{\ \ \ \ }\]
\[\left\{ \begin{matrix} m = 3n + 8\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 2 \cdot (3n + 8) - 3n = 10 \\ \end{matrix} \right.\ \text{\ \ \ }\]
\[\left\{ \begin{matrix} m = 3n + 8\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 6n + 16 - 3n = 10 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} m = 3n + 8 \\ 3n = - 6\ \ \ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} n = - 2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ m = 3 \cdot ( - 2) + 8 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} n = - 2 \\ m = 2\ \ \\ \end{matrix} \right.\ \]
\[Проверка:\ \]
\[\left\{ \begin{matrix} 2 - 3 \cdot ( - 2) = 8\ \ \ \ \ \ \ \ \ \\ 2 \cdot 2 - 3 \cdot ( - 2) = 10 \\ \end{matrix} \right.\ \text{\ \ \ \ }\]
\[\left\{ \begin{matrix} 8 = 8\ \ \ \ \ \\ 10 = 10 \\ \end{matrix} \right.\ \Longrightarrow верно.\]
\[Ответ:(2;\ - 2).\]