Question

Please help with number 8 step by step

Answer 1

It is a function because circles are functions

Explanation:

the formula for a circle is

`(x-h)^2+(y-k)^2=r^2`

(h,k) = center

r=radius

radius is 4 because diameter is 8

Center is (2,1)

plug it into the equation:

`(x-2)^2+(y-1)^2=16`