Solve: x=1,y=2,z=3x+yx = 1, y = 2, z = 3x + yx=1,y=2,z=3x+y.
(1,2,5)(1, 2, 5)(1,2,5)
(1,2,6)(1, 2, 6)(1,2,6)
(1,2,1)(1, 2, 1)(1,2,1)
(1,2,4)(1, 2, 4)(1,2,4)