An angle measures x°. What is the measure of its complement and its supplement?

Two complementary angles will add up to 90 degrees and two supplementary angles will add up to 180 degrees.

x + y = 90

Solve for y.

x + y = 90

y = 90 - x < - - Subtract x from each side

x + y = 180

Solve for y.

x + y = 180

y = 180 - x < - - Subtract x from each side