solve for x if angle 1 and angle 2 are supplementary: angle 1= 5x+6 angle 2= 3x
supplementary means they add up to 180°
so 5x + 6 + 3x = 180
solve for x, then sub back into each of the expressions
so 5x + 6 + 3x = 180
solve for x, then sub back into each of the expressions