Question

angles x and y are supplementary. angle x is 3 times the measure of angle y. what is the measure of angle x? 45° 60° 120° 135°

Answer 1

x = 135°

Explanation:

x and y are supplementary angles, that is they sum to 180° , then

x + y = 180 ← substitute x = 3y into the equation

3y + y = 180

4y = 180 ( divide both sides by 4 )

y = 45

then

x = 3y = 3 × 45° = 135°