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