You can
put this solution on YOUR website!x+y=4
y=-x+4

(graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 2x +4).
y=2x-3

(graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 2x -3).
y=2-2x2=2. I believe you have a mistake in this equation. Too many = signs.