FOR Y 
opposite angles - equal 
angles in a quadrilateral are 360 degrees 
68 + 68 = 136 
360 - 136 = 224
224/2 = 112 degrees
angles on a straight line = 180 degrees 
180 - 112 = 68 
Y = 68
FOR X 
angles on a straight line are 180 degrees 
180 - 68 = 112 degrees
X=112 degrees