You can put this solution on YOUR website! X+Y=3 OR Y=-X+3 (RED LINE)
COORDINATES ARE (0,3) & (3,0)
X+Y=-1 OR Y=-X-1 (GREEN LINE)
COORDINATES ARE (0,-1) (-1,0) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = x +3 and y = -x -1).