Question

Which of the following circles have their centers on the y-axis?

A. (x - 0)^2 + (y - 0)^2 = 44
B. (x + 1)^2 + (y - 7)^2 = 16
C. (x - 4)^2 + (y - 0)^2 = 22
D. (x - 0)^2 + (y + 5)^2 = 74
?????

Answer 1

equation of Y-axis is X=0.
Compare with this equation

Answer 2

Any of them for which the x-coordinate of the center is 0, using the form we talked about before.

Answer 3

A&D???

Answer 4

Yeah