The slope in going to be (4-1)/(-6-3)=-(3/9)=-1/3
We have an equation of y=-1/3x+b
Now, we substitute one of the points, we can choose the easier one, which is (3, 1). We now have an equation of 1=-1/3(3)+b. b=2
So the final equation is y=-1/3x+2
Correct me if I'm wrong 
