Question

∠x and ∠y are supplementary angles ∠y measures 142 what is the measure of x

Answer 1

Supplementary angles add up to 180

⇒ ∠x + ∠y = 180

∠x + ∠y = 180

∠x + 142 = 180

∠x = 180 - 142 = 38°

Answer: x = 38°