I'm just having trouble linearizing a quick function I'm graphing. The function is of a shifted exponential decay from a capacitor : $V(t) = V\_0e^{-t/\tau}+V\_1$. I previously had the function without the $V\_1$ addition shifting it which just simply needed a natural logarithm on both sides, but I'm not sure what to do from here. 

For the graph, we have a list of known values for V and t, $V\_0$ and $\tau$ are the unknowns we have to find. $V\_1$ is assumed to be known, but we have to use the graph to guess as to it's value. I can't take the natural log of both sides because that gets me nowhere, there's no rule for (x + b) in a natural log, and I don't think I can just subtract $V\_1$ from either side because I wouldn't have my known V values to graph anymore.

Any help to this would be greatly appreciated.