Alright, to find the answer to this problem, you have to do both subtraction and addition.
On the figure, you can see that the figure has two right angles.
The values of X and Y are unknown, and have to be figured out using the values of the other two angles that make up the full 180 degrees.
The value of X will be 90 degrees minus 35 degrees.
So, the value of X is 55.
The value of Y will be 90 degrees minus 42 degrees.
So, the value of Y is 38.
Hope this helps!
