Решите систему уравнений: 2x+2y=5; 7x-2y=31.

\[\left\{ \begin{matrix} 2x + 2y = 5\ \ \ \\ 7x - 2y = 31 \\ \end{matrix} \right.\ ( + )\]

\[9x = 36\]

\[x = 4.\]

\[2y = 5 - 2x = 5 - 8 = - 3\]

\[y = - 1,5.\]

\[Ответ:(4; - 1,5).\]