Question 139943
y=2x+5 (red line)
y-x=4
y=x+4 (green line)
{{{ graph( 300, 200, -6, 5, -10, 10, 2x +5, x +4) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions 2x +5 and x +4). 
ANSWER (-1,3)