\[\left\{ \begin{matrix} 2x - y = 1\ \ \ \ \ \ \\ 7x - 6y = - 4 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} y = 2x - 1\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 7x - 6 \cdot (2x - 1) = - 4 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} y = 2x - 1\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 7x - 12x + 6 = - 4 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} y = 2x - 1\ \ \\ - 5x = - 10 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} y = 3 \\ x = 2 \\ \end{matrix} \right.\ \]
\[Ответ:(2;3).\]