Question

The equation of circle O is (x - 2) 2 + (y - 4) 2 = 36. Determine which of these points are on the circumference of the circle. There may be more than one correct answer.
(2, 4)
(8, 4)
(-2, 2)
(2,-2)
(-4, 4)
(-2,-2)
(6, 6)

Answer 1

?

Answer 2

Well, are you able to tell me if (2,4) is on the circumference of the circle?

Answer 3

no! i dont understand

Answer 4

i only have like 10 min left

Answer 5

(2,4) means x=2, y=4.
ALL points on the circumference of the circle satisfy the relation
\[ (x - 2)^2 + (y - 4)^2 = 36\]
So if the point (2,4) is on the circumference, then substituting 2 and 4 for x and y respectively will result in equality. Let's try:
\[ (2 - 2)^2 + (4 - 4)^2 = 0^2+0^2 \ne 36\]
so (2,4) is not on the circumference of the circle.
Does it make any sense to you?

Answer 6

ooo yes !!!!!!! thank u

Answer 7

You're welcome ! :)
You'll need to check every one of the points because there are multiple solutions.

Answer 8

got it!!!!!!!
:)