Question

{ 5x + 6y = 3,
{ x - 2y = -9

Answer 1

5x + 6y = 3

5x - 10y = -45           16y = 48     y = 48 : 16       y = 3

x - 2*3 = -9

x - 6 = -9

x = -9 + 6

x = -3

ответ: (-3 ; 3)

Answer 2

Спасибо!