Question 1085037
it looks like what they're telling you is that angles 1 and 2 are supplementary because the lines are parallel.


if the angles are supplementary, then their sum is 180 degrees.


so, you get x + 50 + 2x - 20 = 180


combine like termws to get 3x + 30 = 180


subtract 30 from both sides of the equation to get 3x = 150


divide both sides of the equation by 3 to get x = 50


when x = 50, x + 50 = 100 and 2x - 20 = 80


their sum is 180, satisfying the requirement that they be supplementary.


your solution is that x = 50 degrees.