Solve: x2+y2=25x^2 + y^2 = 25x2+y2=25 and x2−y2=7x^2 - y^2 = 7x2−y2=7.
(±4,±3)(\pm 4, \pm 3)(±4,±3)
(4,3)(4, 3)(4,3) only
(±5,0)(\pm 5, 0)(±5,0)
(±3,±4)(\pm 3, \pm 4)(±3,±4)