Question 139718
Very close.  You have the radius (2) and the center (1,-3) correct, but you forgot one rather important part of the equation of a circle.


A circle with radius r and center at (h,k) is {{{(x-h)^2+(y-k)^2=r^2}}}


So you need to add the exponents to each of the binomials:


Not: {{{(x-1)+(y+3)=4}}}, but {{{(x-1)^2+(y+3)^2=4}}}