You can put this solution on YOUR website! 2x-y=4 or -y=-2x+4 or y=2x-4
2x-y=6 or -y=-2x+6 or y=2x-6 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 2x -4 and y = 2x -6).
x-2y=8 or -2y=-x+8 or y=-x/-2+8/-2 or y=x/2-4
3x-2y=12 or -2y=-3x+12 or y=-3x/-2+12/-2 or y=3x/2-6 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = x/2 -4 and y = 3x/2 -6).