Question 115329
3x+y=-1 or y=-3x-1 (red line)
9x+3y=-3 or 3y=-9x-3 or y=-9x/3-3/3 or y=-3x-1 (green line)
NOTICE THAT THESE 2 EQUATIONS ARE THE SAME THUS THE LINES ARE SUPERIMPOSED GREEN ON RED.
{{{ graph( 300, 200, -6, 5, -10, 10, y = -3x -1, y = -3x -1) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = -3x -1 and y = -3x -1).