# Relationship Equation Solution 1 Complimentary 60 + x -20 =90 x + 40 = 90 x = 50 2 Supplementary 156 + 4x = 180 156 + 4x = 180 4x = 180 - 156 4x = 24; x = 6 3. Vertically Opposite 2x + 40 = 120 You should be able to get x = 40 4 Supplementary x + 100 + 45 = 180 And again you should get x = 35