Independence from a variable - Graphical confusion

[WMBM]

http://postimg.org/image/pb0eu3ap3/
So I've got this graph, and magnitude, M, depends on the number of points, N,... but it shouldn't.
http://postimg.org/image/pb0eu3ap3/
The line of best fit is... M = a*N ^b

It's been a while since I studied, but knowing their relationship would it be possible to remove M's dependancy on N, i.e. in effort to plot a graph where e.g. M = 3?

Cheers Will

 

[Stephen Tashi]

You aren't using language that has a specific mathematical interpretation. You'll get better advice if you describe the real life situation and say what practical goal you are trying to accomplish.