Ineed with this math problem and how you solved

To get angle Y, you have to do 90 - 27 to get the other angle in the triangle and you get 63. Then you do 180 - (63+51) which is 66. 

Angle Y = 66

90 - 27 = 63      We can do this step because there is a right angle and it's                                       supplement must equal 90° as well.

63 + 51 + y = 180      Triangle Sum Theorum (All sides of a Δ = 180°)

112 + y = 180       Subtract 112 on both sides.
-112        - 112

y = 68                         Final Answer