Question 126107
x+y=4 or y=-x+4 (red line).
-x+y=4 or y=x+2 (green line)
{{{ graph( 300, 200, -6, 5, -10, 10, -x +4 , x +2) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -x +4 and x +2).
ANSWER IS (1,3).