\[\left\{ \begin{matrix} 15x - 4y = 8 \\ - 3x + y = 1\ \\ \end{matrix} \right.\ \]
\[\left\{ \begin{matrix} y = 3x + 1\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 15x - 4(3x + 1) = 8 \\ \end{matrix} \right.\ \]
\[15x - 12x - 4 = 8\]
\[3x = 12\]
\[x = 4.\]
\[y = 3x + 1 = 3 \cdot 4 + 1 = 13.\]
\[Ответ:(4;13).\]