\[\left\{ \begin{matrix} 3x - 4y = 7 \\ 2y + 5x = 3 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} 4y = 3x - 7 \\ 2y = 3 - 5x \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} y = \frac{3}{4}x - \frac{7}{4} \\ y = \frac{3}{2}x - \frac{5}{2} \\ \end{matrix} \right.\ \]
\[Ответ:(1;\ - 1).\]