Graph.
y+1=1/3(x−3)
(Please tell me where to mark it)

I will give you 2 points.
y+1=1/3(x-3)
y+1=1/3x-1
y=1/3x-2
If x=0:
y=0-2
y=-2
(0,-2)
If x=3
y=3*1/3-2
y=1-2
y=-1
(3,-1)