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

the answer is actually (x - 0)^2 + (y + 5)^2 = 74 and (x - 0)^2 + (y - 0)^2 = 44 on apex

Circles A and D have their centers on y-axis.

Step-by-step explanation:

The standard form of a circle is given by

Here (h,k) is the center and r is the radius of the circle.

Now, any point which is in the y- axis has x-coordinate equal to zero.

Since, center of the circle is in y-axis. Hence, x coordinate of the circle is zero. Thus, h = 0

From the given options, circles A and D have their centers on y-axis.