Решите систему уравнений 2x-y=1; 7x-6y=26.

\[\left\{ \begin{matrix} 2x - y = 1\ \ \ \ \ \\ 7x - 6y = 26 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]

\[\left\{ \begin{matrix} y = 2x - 1\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 7x - 6 \cdot (2x - 1) = 26 \\ \end{matrix} \right.\ \]

\[7x - 12x + 6 = 26\]

\[- 5x = 20\]

\[x = - 4.\]

\[y = 2 \cdot ( - 4) - 1 = - 8 - 1 = - 9.\]

\[\left\{ \begin{matrix} x = - 4 \\ y = - 9 \\ \end{matrix} \right.\ \]

\[Ответ:( - 4; - 9).\]