\[\left\{ \begin{matrix} 3x + 4y = 14\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 5x + 2y = 14\ \ | \cdot ( - 2) \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} 3x + 4y = 14\ \ \ \ \ \ \ \ \ \\ - 10x - 4y = - 28 \\ \end{matrix} \right.\ \ ( + )\]
\[- 7x = - 14\]
\[x = 2.\]
\[2y = 14 - 5x = 14 - 10 = 4\]
\[y = 4\ :2 = 2.\]
\[Ответ:(2;2).\]