\[\left\{ \begin{matrix} y - x = 0\ \ \\ 3x - y = 4 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ \ }\left\{ \begin{matrix} y = x\ \ \ \ \ \ \ \ \ \ \ \\ y = 3x - 4 \\ \end{matrix} \right.\ \]
\[y = x\]
| \[x\] | \[0\] | \[1\] | 
|---|---|---|
| \[y\] | \[0\] | \[1\] | 
\[y = 3x - 4\]
| \[x\] | \[0\] | \[1\] | 
|---|---|---|
| \[y\] | \[- 4\] | \[- 1\] | 
\(\ \)
\[Ответ:(2;2).\]