in attachments
Hello dgen,
I believe I answered a very similar question yesterday. You should familiarize yourself with the equation of a circle.
$\displaystyle (x-h)^2+(y-k)^2=r^2$
The center is at $\displaystyle (h, k)$, and the radius is r
$\displaystyle (x-3)^2+(y+5)^2=4^2$
I think you can handle this by now.