You can put this solution on YOUR website! 2x-y=4 or -y=-2x+4 or y=2x-4 (red line) (0,-4)(2,0)
2x-y=6 or -y=-2x+6 or y=2x-6 (green line) (0,-6)(3,0) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = 2x -4 and y = 2x -6).
There is no common solution as these lines never intersect.