Question

In figure OA and OB are opposite rays.If x=42°.What is value of y

Answer 1

Since angle x and 2y are in a straight line
therefore x+2y=180° because of linear pair
42°+2y=180°
2y=138°
y=69°
Hope this hlps u......

Answer 2

x+2y = 180(linear pair)

42+2y=180

2y=180-42

2y=138

y=69

HOPE THIS WILL HELP U