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)