\[\boxed{\text{423\ (423).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\left\{ \begin{matrix} x^{2} - 4 = 0 \\ y^{2} - 9 = 0\ \\ \end{matrix} \right.\ \]
\[x^{2} - 4 = 0\]
\[x^{2} = 4\]
\[x = \pm 2\]
\[две\ прямые:x = 2;\ \ x = - 2.\]
\[y^{2} - 9 = 0\]
\[y^{2} = 9\]
\[y = \pm 3\]
\[две\ прямые:\ \ y = 3;\ \ y = - 3.\]
\[Ответ:(2;3);\ \ ( - 2;3);\ \ (2;\ - 3);\ \ \]
\[( - 2;\ - 3).\]