My Math Forum  

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

Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

Thanks Tree1Thanks
  • 1 Post By skeeter
LinkBack Thread Tools Display Modes
February 26th, 2017, 03:52 AM   #1
Joined: Feb 2017
From: uk

Posts: 6
Thanks: 0

Making a letter the subject of an equation

Hey guys,

I've been studying maths for a few months but I'm really struggling with making a letter the subject when it is on both sides of the equations (in a fraction) i.e. please see below (how would i make t the subject)? The part I struggle with is removing t from one side (there is only '1' 't' on either side so how do i get rid of one without removing the other?)

5y - 11/t = 13 - 7y/t

Any help is much appreciated
tenpence is offline  
February 26th, 2017, 04:00 AM   #2
Math Team
Joined: Jul 2011
From: Texas

Posts: 2,724
Thanks: 1378


start by multiplying every term by $t$ ...


move all terms with a factor of $t$ to the same side, all terms w/o to the other side ...

$5yt -13t=11-7y$

factor out $t$ ...


divide both sides by $5y-13$ ...

Thanks from tenpence
skeeter is offline  
February 26th, 2017, 04:04 AM   #3
Joined: Feb 2017
From: uk

Posts: 6
Thanks: 0

Thank you so much!!!
tenpence is offline  
March 3rd, 2017, 03:59 AM   #4
Math Team
Joined: Jan 2015
From: Alabama

Posts: 2,970
Thanks: 807

Equivalently, starting with
add to both sides:

Subtract 13 from both sides:

Invert both sides:

Finally, multiply both sides by 11- 7y:
Country Boy is offline  

  My Math Forum > High School Math Forum > Elementary Math

equation, letter, making, subject

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
Rearranging this equation to make B the subject mytduxfan Algebra 1 May 8th, 2016 01:42 PM
Help Making X the subject jamesbrown Algebra 1 September 21st, 2015 11:50 AM
Making x the subject TheGoofster Algebra 1 March 20th, 2013 08:54 AM
Making x the subject... TheGoofster Algebra 5 December 28th, 2012 01:04 AM
Making of equation Mathmen Calculus 5 October 22nd, 2010 10:03 AM

Copyright © 2018 My Math Forum. All rights reserved.