Question 69224
3x+y=-1  y=-3x-1
9x+3y=-3  3y=-9x-3  y=-3x-1
{{{ 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).