Question

Angles X and Y are supplementary. Angle X is 3 times the measure of angle Y. What is the measure of angle X?

1.45°

2.60°
3.120°
4.135°

Answer 1

We know, x+y = 180

A.T.Q, x = 3y, y= x/3

substitute the value of y,

x+x/3 = 180

4x = 540

x = 540/4

x=135