Question 187591
y=-3x+1  (RED LINE)
y=3x+1 (GREEN LINE)
{{{ graph( 300, 200, -6, 5, -10, 10, -3x +1, 3x +1) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -3x +1 and 3x +1).