\[\boxed{\text{447\ (447).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\left\{ \begin{matrix} x - 2y = 1 \\ y - x = - 2 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\left\{ \begin{matrix} y = \frac{x - 1}{2} \\ y = x - 2 \\ \end{matrix} \right.\ \]
\[y = \frac{x - 1}{2}\text{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }y = x - 2\]
\[x\] | \[1\] | \[3\] |
---|---|---|
\[y\] | \[0\] | \[1\] |
\[x\] | \[0\] | \[1\] |
---|---|---|
\[y\] | \[- 2\] | \[- 1\] |
\[Ответ:(3;1).\]
\[2)\ \left\{ \begin{matrix} x + y = - 5 \\ 4x - y = - 5 \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ \ \ \ \ }\]
\[\left\{ \begin{matrix} y = - 5 - x \\ y = 4x + 5 \\ \end{matrix} \right.\ \]
\[y = - 5 - x\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ y = 4x + 5\ \]
\[x\] | \[- 1\] | \[- 2\] |
---|---|---|
\[y\] | \[- 4\] | \[- 3\] |
\[x\] | \[0\] | \[- 2\] |
---|---|---|
\[y\] | \[5\] | \[- 3\] |
\[Ответ:( - 2;\ - 3).\]