Solve: y=2y = 2y=2 and x2+y2=13x^2 + y^2 = 13x2+y2=13.
(±3,2)(\pm 3, 2)(±3,2)
(3,2)(3, 2)(3,2) only
(±11,2)(\pm 11, 2)(±11,2)
No solution