If the set of points have a constant distance (radius, r) from a point, the set of points form a circle, which has the standard equation:
(x-x0)^2+(y-y0)^2=r^2
where (x0,y0) is the given point (-2,-6), and r=radius=2.
Substituting, the equation is then
(x-(-2))^2+(y-(-6))^2=2^2, or
(x+4)^2+(y+6)^2=4......(1)
