Use polyfit to find standard curve fitting functions

I have two matrix

T3_All and T3_Max

Given these two matrices how do I find the linear, power and exponential functions using polyfit function?

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Walter Roberson]

polyfit(x, y, 1)

polyfit(x, exp(y), 1)  %you might need to take log() of part of the results

polyfit(x, log(y), 1)   %you might need to take exp() of part of the results