Question 950582
You have to solve with point slope form, but you can check your work by solving with slope-intercept form. You should have the same result. 
Parallel lines have the same slope (m=-1/3), x=-6, y=-3
plug in to form:
y=mx+b
-3=-1/3(-6)+b
-3=2+b
-5=b 
So the equation is:y=-1/3x-5
It checks, your done.