Question

a) {3y - 7x = 4
{2y+5x=22;

Answer 1

Ответ:

$3y - 7x= 4 \\ 2y + 5x = 22 \\ \\ y = \frac{22 - 5x}{2} = 11 - 2.5x \\ 33 - 7.5x - 7x = 4 \\ 14.5x = 29 \\ x = 2 \\ y = 11 - 2.5 \times 2 = 6$

(6;2)