Answer:
A
Explanation:
1. We know that the radius is equal to 8 and therefore x-13=8 and y+2=8.
2. x-13=8
(to isolate the 'x' to one side, add 13 to both sides to subtract the 13 on the left side)
x=21
3. y+2=8
(to isolate the 'y' to one side, minus 2 from both sides to remove the positive two on the left side)
y=6