Those 2 angles makes up corresponding angles in parallel lines. Which means, both two angles equal to each other because this is a rule that exists when both of the lines are parallel to each other which is indicated with red arrows in the photo. 75 = 11x - 2 75 + 2 = 11x 77 = 11x X = 77 / 11 X = 7 The answer is 7.
