Solve: 2x−y=1,x+y=52x - y = 1, x + y = 52x−y=1,x+y=5.
(2,3)(2, 3)(2,3)
(3,2)(3, 2)(3,2)
(1,4)(1, 4)(1,4)
(0,−1)(0, -1)(0,−1)