\[\boxed{\text{699}\text{.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\left\{ \begin{matrix} x^{2} - 4 = 0 \\ y^{2} - 9 = 0\ \\ \end{matrix} \right.\ \]
\[Ответ:(2;3);\ \ ( - 2;3);\ \]
\[\ (2;\ - 3);\ \ ( - 2;\ - 3).\]