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