Answer:
the y-coordinate is ±√21
Step-by-step explanation:
Aren't you saying that the point lies ON the circle?
If so:
(x - h)^2 + (y - k)^2 = r^2
This becomes
x^2 + y^2 = r^2 because the center is at (0, 0).
This becomes x^2 + y^2 = 25 because the radius is 5.
Let's substitute -2 for x and find y:
4 + y^2 = 25, or y^2 = 21
Then the y-coordinate is ±√21
