You can put this solution on YOUR website! Y=1/3x+-6
IF IT IS A +6 THEN: (red line)
Y=(0,6)
0=X/3+6
X/3=-6
X=-18 OR (-18,0) (graph 300x200 pixels, x from -20 to 20, y from -10 to 10, of TWO functions x/3 +6 and x/3 -6).
Y=X/3-6
Y=(0,-6)
0=X/3-6
X/3=6
X=6*3
X=18 (0,2)(green line)