\[\left\{ \begin{matrix} y = 4x - x^{2} \\ 2x + y = 5\ \ \\ \end{matrix} \right.\ \Longrightarrow \left\{ \begin{matrix} y = 4x - x² \\ y = 5 - 2x\ \\ \end{matrix} \right.\ \]
\[x = 1;\ \ x = 5\]
\[Ответ:(1;3);(5;\ - 5).\]