You can put this solution on YOUR website! 5X+4Y=7 OR 4Y=-5X+7 OR Y=-5X/4+7/4 (RED LINE)
X-3Y=9 OR -3Y=-X+9 OR Y=-X/-3+9/-3 OR Y=X/3-3 (GREEN LINE)
ANSWER(3,-2) (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -5x/4 +7/4 and x/3 -3).