\[\left\{ \begin{matrix} y = - 3x + 10 \\ x^{2} + y^{2} = 10\ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} y = - 3x + 10\ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ x² + (10 - 3x)^{2} = 10 \\ \end{matrix} \right.\ \]
\[x^{2} + 100 - 60x + 9x^{2} - 10 = 0\]
\[10x² - 60x + 90 = 0\ \ \ |\ :10\]
\[x^{2} - 6x + 9 = 0\]
\[(x - 3)^{2} = 0\]
\[x = 3\]
\[\left\{ \begin{matrix} x = 3 \\ y = 1 \\ \end{matrix} \right.\ \]
\[Ответ:(3;1).\]