\[\left\{ \begin{matrix}
2x + y = 5 \\
x + 2y = 0 \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
y = 5 - 2x \\
2y = - x\ \ \ \ \\
\end{matrix} \right.\ \text{\ \ \ \ \ \ }\]
\[\left\{ \begin{matrix}
y = 5 - 2x\ \ (1) \\
y = - \frac{1}{2}x\ \ \ \ \ (2) \\
\end{matrix} \right.\ \]
\[(1)\ y = 5 - 2x\]
| \[x\] | \[0\] | \[1\] |
|---|---|---|
| \[y\] | \[5\] | \[3\] |
\[(2)\ y = - 0,5x\]
| \[x\] | \[0\] | \[2\] |
|---|---|---|
| \[y\] | \[0\] | \[- 1\] |

\[Ответ:(3,5;\ - 1,8).\]