Question 101100
4X+Y=16 OR Y=-4X+16 (RED LINE)
4X+Y=20 OR Y=-4X+20 (GREEN LINE)
{{{ graph( 300, 200, -6, 5, -10, 20, y = -4x +16, y = -4x +20) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 20, of TWO functions y = -4x +16 and y = -4x +20).