You can put this solution on YOUR website! X-Y=3 OR -Y=-X+3 OR Y=X-3 (RED LINE)
X-2Y=3 OR -2Y=-X+3 OR Y=-X/-2+3/-2 OR Y=X/2-3/2 (GREEN LINE) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = x -3 and y = x/2 -3/2).
SOLUTION (3,0)