\[\left\{ \begin{matrix} 2x + 3y = 7\ \ \\ 7x - 3y = 11 \\ \end{matrix} \right.\ ( + )\]
\[9x = 18\]
\[x = 2.\]
\[3y = 7 - 2x\]
\[3y = 7 - 2 \cdot 2 = 3\]
\[y = 1.\]
\[Ответ:(2;1).\]