\[\left\{ \begin{matrix} x - 2y = 11\ \\ 0,5y + x = 1 \\ \end{matrix} \right.\ \Longrightarrow \left\{ \begin{matrix} 2y = x - 11\ \ \ \ \\ 0,5y = - x + 1 \\ \end{matrix} \right.\ \Longrightarrow\]
\[\Longrightarrow \left\{ \begin{matrix} y = 0,5x - 5,5 \\ y = - 2x + 2\ \ \ \\ \end{matrix} \right.\ \]
\[Ответ:(3;\ - 4).\]