You can put this solution on YOUR website! 2y+4x=6 or 2y=-4x+6 or y=-4x/2+6/2 or y=-2x+3 (red line)
3y+6x=9 or 3y=-6x+9 or y=-6x/3+9/3 or y=-2x+3 (green line)
Because these are identical equations there is no unique solution of x or y. (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -2x +3 and -2x +3).