Question

Подробно. Способ подстановки. ​

Answer 1

номер 1

х=-8+2у

$\frac{2x - y}{6} - \frac{3x + 2y}{3} = - 20$

$\frac{2( - 9 + 2y) - y}{6} - \frac{3( - 9 + 2y) + 2y}{3} = - 20$

$y = 12 \\ x = - 9 + 12 \times 2 \\ x = 15$

(15;12)