Solve: 4x+y=94x + y = 94x+y=9 and y=1y = 1y=1.
(2,1)(2, 1)(2,1)
(1,1)(1, 1)(1,1)
(2.25,1)(2.25, 1)(2.25,1)
(4,1)(4, 1)(4,1)