Question 694517
X=2y+1 
2Y=X-1 
Y=X/2-1/2 RED LINE.
X+3y=16 
3Y=-X+16 
Y=-X/3+16/3 GREEN LINE.
{{{ graph( 300, 200, -20, 5, -10, 10, x/2 -1/2, x/3 +16/3) }}}