Answer: x=42 y=48
Explanation:
The angle with 42° and the blank space should add up to 90° so you would have to do 90-42=48° to find the blank space. As opposite angles are equal that means y=48° too.
Then to find out what x is you have to do 90-48=42° as the part with x and y in it has to add up to 90°.
You can check this by checking the two quarters. They should both add up to 90°.
42+48=90°
48+42=90°
So we know its correct.
Hope this helps :)