\[\left\{ \begin{matrix} x - 7y = 0\ \ \ \ \ \\ 12x + y = 17 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} x = 7y\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 12 \cdot 7y + y = 17 \\ \end{matrix} \right.\ \text{\ \ \ \ \ }\]
\[\left\{ \begin{matrix} x = 7y\ \ \ \ \ \ \ \ \ \ \ \ \\ 84y + y = 17 \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} x = 7y\ \ \ \ \\ 85y = 17 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} y = 0,2\ \ \ \ \ \\ x = 7 \cdot 0,2 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} y = 0,2 \\ x = 1,4 \\ \end{matrix} \right.\ \]
\[Ответ:(1,4;0,2).\]