Y=9x-28и y=13x+12 помогите решить
9x - 28 = 13x + 12 9x - 13x = 28 + 12 -4x = 40 x = 40 : (-4) x= -10 y = 9 • (-10) -28 y = -90 - 28 y = -118
9x-28=13x+12: 13x-9x=-28-12: 4x=-40: x=-10; y=9*(-10)-28=-118. y=13*(-10)+12=-118,