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