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