\[y = 3x + 6\ \ \ \ и\ \ \ y = - 2x - 1\]
\[\left\{ \begin{matrix}
y = 3x + 6\ \ \ \\
y = - 2x - 1 \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
y = 3x + 6\ \ \ \ \ \ \ \ \ \ \ \ \ \ \\
3x + 6 = - 2x - 1 \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
y = 3x + 6 \\
5x = - 7\ \ \ \ \ \\
\end{matrix} \right.\ \]
\[\left\{ \begin{matrix}
x = - \frac{7}{5}\text{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ } \\
y = 3 \cdot \left( - \frac{7}{5} \right) + 6 \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
x = - 1,4 \\
y = 1,8\ \ \ \\
\end{matrix} \right.\ \]
\[Ответ:( - 1,4;1,8).\]