\[\left\{ \begin{matrix} 5x - 4y = 8\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ 15x - 12y = 18\ \ \ |\ :3 \\ \end{matrix} \right.\ \Longrightarrow \left\{ \begin{matrix} 5x - 4y = 8 \\ 5x - 4y = 6 \\ \end{matrix} \right.\ \]
\[Ответ:нет\ решений.\ \]