Simple...
you have: x-3y=18
You want to convert it into slope-intercept form or y=mx+b form-->>>
x-3y=18
Isolate the variable-->>
x-3y=18
-x -x
-3y=-x+18
Now simply divide...
[tex] \frac{-3y}{-3} = \frac{-x+18}{-3} [/tex]
y=[tex] \frac{1}{3}x -6[/tex]
Thus, your answer.
