Answer:
fill in the point into your equation and check it.
Explanation:
You did a great job writing the equation. Now use the equation and the (x, y) in each part to find out which points are on the circle. For example, part A, (3,9) use x =3 and y = 9 in your equation
(3+3)^2 + (9-1)^2 = 100?
6^2 + 8^2 = 100
36 + 64 = 100
100 = 100 this checks so A(3,9) IS on the circle.
But for B(6,8), that is not on the circle bc it does not check:
(6+3)^2 + (8-1)^2 =100?
9^2 + 7^2 = 100
81 + 49 = 100
130 = 100 false. This does not check. (6,8) is not on the circle.
Be sure to check C, D, E