Решите систему уравнений: 3x=2; 9x-y=7.

\[\left\{ \begin{matrix} 3x = 2\ \ \ \ \ \ \ \ \\ 9x - y = 7 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]

\[\left\{ \begin{matrix} x = \frac{2}{3}\text{\ \ \ \ \ \ \ \ \ \ \ \ \ \ } \\ 9 \cdot \frac{2}{3} - 7 = y \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]

\[\left\{ \begin{matrix} x = \frac{2}{3}\text{\ \ \ \ \ \ \ \ \ } \\ 6 - 7 = y \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]

\[\left\{ \begin{matrix} x = \frac{2}{3}\text{\ \ \ } \\ y = - 1 \\ \end{matrix} \right.\ \]

\[Ответ:\left( \frac{2}{3}; - 1 \right)\text{.\ }\]