\[\boxed{\text{1066.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ x - y - 1 = 0 \Longrightarrow x = 1 + y\]
\[x\] | \[1\] | \[2\] |
---|---|---|
\[y\] | \[0\] | \[1\] |
\[\textbf{б)}\ 3x = y + 4 \Longrightarrow y = 3x - 4\]
\[x\] | \[0\] | \[1\] |
---|---|---|
\[y\] | \[- 4\] | \[- 1\] |
\[\textbf{в)}\ 2 \cdot (x - y) + 3y = 4\]
\[2x - 2y + 3y = 4\]
\[2x + y = 4\]
\[y = 4 - 2x\]
\[x\] | \[4\] | \[0\] |
---|---|---|
\[y\] | \[0\] | \[2\] |
\[\textbf{г)}\ (x + y) - (x - y) = 4\]
\[x + y - x + y = 4\]
\[2y = 4\]
\[y = 2\]