how to solve 3x+y=10;x-4y=-1
3x + y = 10 x - 4y = -1---------------12x + 4y = 40 x - 4y = -1 13x = 39 x = 3 x - 4y = -1 3 - 4y = -1 -4y = -4 y = 1 (x, y) = (3, 1)