
\[\left\{ \begin{matrix}
- 5x + 30y = 15 \\
- 5x + 15y = 0\ \\
\end{matrix} - \right.\ \]
\[\left\{ \begin{matrix}
15y = 15 \\
x = \frac{15y}{5}\text{\ \ } \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
y = 1 \\
x = 3 \\
\end{matrix} \right.\ \]
\[Ответ:(3;1)\text{.\ }\]