\[\left\{ \begin{matrix}xy = 4\ \ \ \ \ \\y = x + 1 \\\end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ }\left\{ \begin{matrix}y = \frac{4}{x}\text{\ \ \ \ \ \ \ } \\y = x + 1 \\\end{matrix} \right.\ \]
\[Ответ:(1,6;2,6);( - 2,6; - 1,6).\]