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Inequalities and Data Sufficiency

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Manager
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Joined: 09 Jul 2010
Posts: 122

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Inequalities and Data Sufficiency [#permalink]

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New post 28 May 2012, 10:54
Hi All,

I am having lot of difficulty in solving data sufficiency problems involving equalities using algebraic manipulations.

I have below questions

1. Are all the Data sufficiency inequality problems that involve only one variable (say x) solvable if we set x to some set of values like 2,1,12,0, -1/2,-1,-2... depending on the constraints of the problem

2. When is it that algebraic manipulations are a must and above method will not work?

Thanks

Kudos [?]: 21 [0], given: 2

Manager
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Joined: 08 Apr 2012
Posts: 128

Kudos [?]: 107 [0], given: 14

Re: Inequalities and Data Sufficiency [#permalink]

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New post 29 May 2012, 06:58
raviram80 wrote:
Hi All,

I am having lot of difficulty in solving data sufficiency problems involving equalities using algebraic manipulations.

I have below questions

1. Are all the Data sufficiency inequality problems that involve only one variable (say x) solvable if we set x to some set of values like 2,1,12,0, -1/2,-1,-2... depending on the constraints of the problem

2. When is it that algebraic manipulations are a must and above method will not work?

Thanks


Hi raviram80.

You cannot classify problems like this. I would advise you to strengthen your concepts.

Follow this link from forum threads. It's great.

inequalities-on-gmat-ds-126157.html

If you have specific queries do post.

Regards,

Shouvik.
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admin@edvento.com

Kudos [?]: 107 [0], given: 14

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Magoosh GMAT Instructor
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Joined: 28 Dec 2011
Posts: 4420

Kudos [?]: 8424 [1], given: 102

Re: Inequalities and Data Sufficiency [#permalink]

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New post 11 Jun 2012, 10:26
1
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Expert's post
raviram80 wrote:
Hi All,

I am having lot of difficulty in solving data sufficiency problems involving equalities using algebraic manipulations.

I have below questions

1. Are all the Data sufficiency inequality problems that involve only one variable (say x) solvable if we set x to some set of values like 2,1,12,0, -1/2,-1,-2... depending on the constraints of the problem

2. When is it that algebraic manipulations are a must and above method will not work?

Thanks


Dear raviram80

It does sound like you need to strength you understanding of concepts, especially algebra. I recommend posting specific questions in this forum and learning from the expert answers.

Here's a free lesson video you may find helpful about picking numbers on DS:
http://gmat.magoosh.com/lessons/368-choosing-numbers

I hope that helps. Let me know if you have any further questions.

Mike :)
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Magoosh Test Prep

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Kudos [?]: 8424 [1], given: 102

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Joined: 23 Jul 2013
Posts: 9

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Re: Inequalities and Data Sufficiency [#permalink]

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New post 26 Jul 2014, 23:58
Data Sufficiency Inequality
Need Help!

Is x = y ?

a) x^2 = xy
b) x^2 = y^2

OA is 'C'

When i solve it i get answer as 'E'
Statement 1 alone is not sufficient
Statement 2 alone is not sufficient
When you combine xy = y^2
xy - y^2 = 0
y(x-y) = 0
this is also not sufficient.
Please correct me if i am making mistake

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Joined: 02 Sep 2009
Posts: 41873

Kudos [?]: 128601 [0], given: 12180

Re: Inequalities and Data Sufficiency [#permalink]

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New post 27 Jul 2014, 03:22
AkshayDavid wrote:
Data Sufficiency Inequality
Need Help!

Is x = y ?

a) x^2 = xy
b) x^2 = y^2

OA is 'C'

When i solve it i get answer as 'E'
Statement 1 alone is not sufficient
Statement 2 alone is not sufficient
When you combine xy = y^2
xy - y^2 = 0
y(x-y) = 0
this is also not sufficient.
Please correct me if i am making mistake


This question is discussed here: is-x-y-98413.html Please go through that thread and post your questions/doubts if any, there.

Please read posting rules: rules-for-posting-please-read-this-before-posting-133935.html Thank you.


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Kudos [?]: 128601 [0], given: 12180

Re: Inequalities and Data Sufficiency   [#permalink] 27 Jul 2014, 03:22
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