\[\left\{ \begin{matrix} x + y = 5\ \ \ \ \ \\ 4x - y = 10 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} y = 5 - x\ \ \ \ \ \\ y = 4x - 10 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} x = 3 \\ y = 2 \\ \end{matrix} \right.\ \]
\[Ответ:(3;2).\]