Question

point A has an x coordinate of -2 and lies in a circle with a center at (0,0) and a radius of 5 . to the nearest tenth , what is the y-coordinate for point a ?

Answer 1

The answer is B 4.6

Explanation:

Its on edgen 2022

Answer 2

the y-coordinate is ±√21

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