My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
November 17th, 2009, 02:29 PM   #1
Newbie
 
Joined: Nov 2009

Posts: 3
Thanks: 0

It is possible to rearrange n = ln(x)/ln(y) in terms of x/y?

I have tried to rearrange n = ln(x)/ln(y) in terms of x and y, used all the log and exponential rules that I know and I couldn't get anything. It's an expression that I have been trying to solve since last week so that I could get useful data from some kinetics experiments...

Thank you very much for any help/suggestion in advance!
jazzycafe is offline  
 
November 17th, 2009, 03:39 PM   #2
Global Moderator
 
Joined: May 2007

Posts: 6,834
Thanks: 733

Re: It is possible to rearrange n = ln(x)/ln(y) in terms of x/y?

Quote:
Originally Posted by jazzycafe
I have tried to rearrange n = ln(x)/ln(y) in terms of x and y, used all the log and exponential rules that I know and I couldn't get anything. It's an expression that I have been trying to solve since last week so that I could get useful data from some kinetics experiments...

Thank you very much for any help/suggestion in advance!
nln(y)=ln(x)
y^n=x
mathman is offline  
November 18th, 2009, 04:30 AM   #3
Newbie
 
Joined: Nov 2009

Posts: 3
Thanks: 0

Re: It is possible to rearrange n = ln(x)/ln(y) in terms of x/y?

Quote:
Originally Posted by mathman
nln(y)=ln(x)
y^n=x
Please correct me if I'm wrong - I have gotten that expression before but I still can't get an expression in terms of x/y even with that.
jazzycafe is offline  
November 18th, 2009, 01:38 PM   #4
Global Moderator
 
Joined: Dec 2006

Posts: 21,019
Thanks: 2254

Why would you expect to? Wouldn't you fail also if you started with something simpler, such as y = nx? What exactly did you mean by "get an expression in terms of x/y"? Would y = (x/y)^(1/(n - 1)) count?
skipjack is online now  
November 18th, 2009, 01:40 PM   #5
Global Moderator
 
Joined: May 2007

Posts: 6,834
Thanks: 733

Re: It is possible to rearrange n = ln(x)/ln(y) in terms of x/y?

Quote:
Originally Posted by jazzycafe
Quote:
Originally Posted by mathman
nln(y)=ln(x)
y^n=x
Please correct me if I'm wrong - I have gotten that expression before but I still can't get an expression in terms of x/y even with that.
I am not sure what you are looking for? What do mean exactly by "expression"?

y^(n-1) = x/y
mathman is offline  
November 18th, 2009, 04:20 PM   #6
Newbie
 
Joined: Nov 2009

Posts: 3
Thanks: 0

Re: It is possible to rearrange n = ln(x)/ln(y) in terms of x/y?

*Scratch head*

Apologies in advance if I wasn't wording it properly - I have always been taught that rearranging an equation in terms of x means that you want x = R.H.S. where R.H.S. does not contain x.

So what I meant by rearranging n = ln(x)/ln(y) in terms of x/y is an equation in the form of x/y = f(n)... I think; and that seems beyond me... :\
jazzycafe is offline  
November 18th, 2009, 05:58 PM   #7
Global Moderator
 
Joined: Dec 2006

Posts: 21,019
Thanks: 2254

That's not the usual meaning, but you already have x/y = y^(n - 1). That equation implies n cannot stay the same when x and y are doubled unless n = 1. Hence an equation of the form x/y = f(n) is possible only if n has the fixed value 1, when 1 = ln(x)/ln(y) reduces to x/y = 1.
skipjack is online now  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
lnx or lny, rearrange, terms, x or y



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rearrange for two sets of Brackets McN41R Algebra 3 March 9th, 2014 09:08 AM
Rearrange for x. Is this even possible? OrganDonor Algebra 3 July 24th, 2013 11:40 AM
rearrange formula to find for y keith6292 Elementary Math 2 January 10th, 2013 12:02 PM
rearrange equation scaryclairey Algebra 3 December 10th, 2008 06:13 AM
Rearrange formula lensgrinder Algebra 4 February 20th, 2008 07:00 PM





Copyright © 2019 My Math Forum. All rights reserved.