Answer:
A linear pair of angles is formed when two lines intersect. Two angles are said to be linear if they are adjacent angles formed by two intersecting lines. The measure of a straight angle is 180 degrees, so alinear pair of angles must add up to 180 degrees
So, x + y = 180
x = 1/3(y)
1/3(y) + y = 180
4/3(y) = 180
y = 135