Which pair (x,y)(x, y)(x,y) satisfies x2−y2=15x^2 - y^2 = 15x2−y2=15?
(4,1)(4, 1)(4,1)
(5,2)(5, 2)(5,2)
(8,7)(8, 7)(8,7)
(3,2)(3, 2)(3,2)