You can put this solution on YOUR website! 2x-y=4
-y=-2x+4
y=2x-4 (red line)
2x-y=3
-y=-2x+3
y=-2x-3 (green line) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -2x -4 and -2x -3).
There is no unique solution for x & y beause these 2 lines do not intersect.