Question

y=9x-28и y=13x+12 помогите решить

Answer 1

9x - 28 = 13x + 12
9x - 13x = 28 + 12
-4x = 40
x = 40 : (-4)
x= -10

y = 9 • (-10) -28
y = -90 - 28
y = -118

Answer 2

9x-28=13x+12: 13x-9x=-28-12: 4x=-40: x=-10; y=9*(-10)-28=-118. y=13*(-10)+12=-118,