GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 16 Nov 2019, 15:20

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Two-part question about solving equations with variables on both sides

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Intern
Intern
avatar
Joined: 17 Oct 2019
Posts: 1
Two-part question about solving equations with variables on both sides  [#permalink]

Show Tags

New post 17 Oct 2019, 11:22
First, is it best practice to solve/break down the variable before the constant or the other way around? Second, why is it so common to move the variable to the left side of the equation as opposed to the right side. I notice this in almost all tutorial videos but I have not seen one video that explains why variables are almost always moved to the left side. Could someone help me understand this, please?
Manager
Manager
User avatar
G
Joined: 16 May 2019
Posts: 112
Re: Two-part question about solving equations with variables on both sides  [#permalink]

Show Tags

New post 17 Oct 2019, 18:39
1
WilsonPatel wrote:
First, is it best practice to solve/break down the variable before the constant or the other way around? Second, why is it so common to move the variable to the left side of the equation as opposed to the right side. I notice this in almost all tutorial videos but I have not seen one video that explains why variables are almost always moved to the left side. Could someone help me understand this, please?


WilsonPatel - Welcome to the community. In terms of "best practice," there is no set way that you must use to solve an algebraic equation, other than to observe basic mathematical principles. As to the second question, I suspect that most people just prefer to keep information in a left-to-right format to mimic the way many of them read. It would be interesting to see if someone teaching in Hebrew or Arabic, for example, approached the same problem in left-to-right fashion or switched to right-to-left to mimic their own reading tendencies. For my part, I just move the smaller unknown to the larger one, regardless of which side the larger one may be on. For example, in the equation 2x + 5 = 4x - 8, I would move the 2x to the right-hand side and simultaneously move the 8 over to the 5 (to isolate the variable), so the next step on my note board would be 13 = 2x. My third step would be even sloppier, with no equation at all: 6.5. I have no idea what this method may say about me, other than that I dislike following a strict method of solving mathematical equations. In fact, I am more like a child: I like to jump in and just get my hands dirty.

Good luck with your studies, however you choose to undertake them.

- Andrew (GMAT™ tutor)
Intern
Intern
avatar
B
Joined: 13 Oct 2019
Posts: 6
Two-part question about solving equations with variables on both sides  [#permalink]

Show Tags

New post 19 Oct 2019, 11:10
WilsonPatel wrote:
First, is it best practice to solve/break down the variable before the constant or the other way around? Second, why is it so common to move the variable to the left side of the equation as opposed to the right side. I notice this in almost all tutorial videos but I have not seen one video that explains why variables are almost always moved to the left side. Could someone help me understand this, please?


We can not multiply or divide by a variable across the inequality sign. Because we do not know the sign of that particular variable.
If the sign is stated in the question stem (X>0) then you can multiply or divide. Otherwise, you can not

Please Hit +1 Kudos if you find it helpful
Senior Manager
Senior Manager
User avatar
V
Joined: 25 Sep 2018
Posts: 449
Location: United States (CA)
Concentration: Finance, Strategy
GMAT 1: 640 Q47 V30
GPA: 3.97
WE: Investment Banking (Investment Banking)
Reviews Badge CAT Tests
Re: Two-part question about solving equations with variables on both sides  [#permalink]

Show Tags

New post 19 Oct 2019, 11:19
To each it's own. Solving mathematical equations is like an art. it just comes to you with practice. There are just a certain rules you have to follow, rest is up to you
_________________
Why do we fall?...So we can learn to pick ourselves up again
GMAT Club Bot
Re: Two-part question about solving equations with variables on both sides   [#permalink] 19 Oct 2019, 11:19
Display posts from previous: Sort by

Two-part question about solving equations with variables on both sides

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne