Question

How many degrees are x and y?

Answer 1

Y is 68 degrees because it is the same thing as the thing on the left. So x is 112 because a straight line/semi-circle equals 180. Since the x+y equals a semi-circle (180 degrees) you have to do 180 - 68 equals 112. 

Answer 2

Y = 68°
Corresponding angles between parallel lines are equal

x and y form a linear pair.
x + y = 180°
68 + x= 180
x= 112°