Ответ:

[tex]x = \frac{5}{2} + \frac{1}{2} y \\ - 3x + 5y = 3 \\ 5x - 2y = 6 \\ - 7x - 2y = - 6 \\ - 3( \frac{5}{2} + \frac{1}{2} y) + 5y = 3 \\ 5( \frac{5}{2} + \frac{1}{2} y) - 2y = 6 \\ - 7( \frac{5}{2} + \frac{1}{2} y) - 2y = - 6 \\ y = 3 \\ y = - 13 \\ y = - \frac{2 3}{11} [/tex]