Question

{x+2y=6 {3x+2y=-6 подстановка

Answer 1

x+2y= 6

3x+2y= -6

х = 6-2у

3(6-2у) + 2у = -6

18 - 6у + 2у = -6

4у = 18+6 = 24

у = 6

х = 6 - 2*6 = -6