How do I prove I=(V(sub b))/R*e^-t/RC experimentally

[Dester]

1. I've been tasked with proving I=(V(sub b))/R*e^-t/RC on charging capacitor experimentally, with a function generator.
2. Can you explain the graph here http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capchg.html

Well, I have a dataset, and now, uh, what? How do I prove this monster with data

 

[CWatters]

Plot your data, both V vs t and V vs e^-t/RC.