Which pair satisfies x+y=3x + y = 3x+y=3 and x−y=1x - y = 1x−y=1?
(2,1)(2, 1)(2,1)
(1,2)(1, 2)(1,2)
(3,0)(3, 0)(3,0)
(0,3)(0, 3)(0,3)