Please help!!! I understand x° but I am confused on how to come up with a value for y°. An explanation would great!!

Answer:
50 degrees
Explanation:
The sum of the degrees inside a triangle is 180 degrees. Since x is 40, the sum of the inner angles would be x + y + (x + y) which is 40 + y + 40 + y.
Set that equal to 180:
2y+80=180
2y=100
y=50