The equation you gave (-9x - 36 = 6x) does not have y included
anywhere. Assuming you meant that -9x - 36 = 6x + y: Step 1: Give y
its own side: -9x - 36 -6x = 6x - 6x + y -15x -36 = y Step 2: Set x
as 0 -15(0) - 36 = y y = -36 The y-intercept is -36