Решите систему уравнений 4x-7y=-12; -4x+3y=12.

\[\left\{ \begin{matrix}
4x - 7y = - 12 \\
- 4x + 3y = 12 \\
\end{matrix} \right.\ ( + )\text{\ \ \ \ }\]

\[\left\{ \begin{matrix}
- 4y = 0\ \ \ \ \ \ \ \ \ \\
4x = 7y - 12 \\
\end{matrix} \right.\ \text{\ \ \ \ \ }\left\{ \begin{matrix}
y = 0\ \ \ \ \ \ \ \ \\
4x = - 12 \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ }\]

\[\left\{ \begin{matrix}
y = 0\ \ \\
x = - 3 \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ }\]

\[Ответ:( - 3;0).\]