\[\boxed{\text{677.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ 3x - 2y = 5\]
\[2y = 3x - 5\]
\[y = 1,5x - 2,5.\]
\[\textbf{б)}\ x + 2y - 3 = 0\]
\[2y = 3 - x\]
\[y = 1,5 - 0,5x.\]
\[\textbf{в)}\ 3x - 4y = - 1\]
\[4y = 3x + 1\]
\[y = \frac{3}{4}x + \frac{1}{4}.\]