Using Graph to determine constants in equation

[yardy_genius]

Hello,

i have the equation F= x + kx^n

I am trying to determine the constants k and n? where i have the ranges for F and x

is what i am doing correct?

log F= logx + logk+ nlogx

log F= logx(1+n) + logk


ok i would then plot logF vs Log x. if i am correct logk = y intercept and from that k can be calculated. How would i use the gradient to find the value of n. can someone please give me some assistance. much appreciated.

 

[ehild]

Hello,

i have the equation F= x + kx^n

I am trying to determine the constants k and n? where i have the ranges for F and x

is what i am doing correct?

log F= logx + logk+ nlogx

No, it is WRONG... log(a+b) is not equal to log(a )+ log(b)

But log(F-x)=log(kx^n)= logk+n logx.

Plot out log(F-x) in terms of logx. It has to be a straight line, with y-intercept logk and slope n.

ehild

 

[yardy_genius]

No, it is WRONG... log(a+b) is not equal to log(a )+ log(b)

But log(F-x)=log(kx^n)= logk+n logx.

Plot out log(F-x) in terms of logx. It has to be a straight line, with y-intercept logk and slope n.

ehild

thank you very much for that correction!