Hello Vershondia
This is a circle centered on the origin with a radius of 4
The equation of a circle is
(x-h)2 + (y-k)2 = r2
where (h,k) is the center of the circle
When the circle is centered on the origin, the equation becomes
(x-0)2 + (y-0)2 = r2
which is equivalent to
x2 + y2 = r2
Hope this helps.
