It is currently 26 Jun 2017, 23:59

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Is |x|>|y|? 1) x^2>y^2 2) x>y

Author Message
Senior Manager
Joined: 04 Jun 2007
Posts: 366
Is |x|>|y|? 1) x^2>y^2 2) x>y [#permalink]

### Show Tags

04 Oct 2007, 20:26
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Is |x|>|y|?
1) x^2>y^2
2) x>y
Intern
Joined: 03 Oct 2007
Posts: 16

### Show Tags

04 Oct 2007, 21:17
r019h wrote:
Is |x|>|y|?
1) x^2>y^2
2) x>y

1) is sufficient
2) is insufficient

Director
Joined: 03 May 2007
Posts: 872
Schools: University of Chicago, Wharton School

### Show Tags

04 Oct 2007, 23:12
r019h wrote:
Is |x|>|y|?

1) x^2>y^2
2) x>y

interesting..

1: no matter whether x and y are fraction, -ve or +ve, if x^2 > y^2, then lxl > lyl.
2. not true. if x = -1 and y = -5, it doesnot hold. if x and y +ves, then it holds.

so A.
Director
Joined: 09 Aug 2006
Posts: 755

### Show Tags

04 Oct 2007, 23:16
r019h wrote:
Is |x|>|y|?
1) x^2>y^2
2) x>y

A.

Stat 1: If x^2 > y^2 then |x| has to be greater than |y|; suff.

Stat 2: Insuff. Plug in for x and y to prove.
Senior Manager
Joined: 04 Jun 2007
Posts: 366

### Show Tags

05 Oct 2007, 10:35
yep, OA is A. I tend to get nervous about modulus problems.
CEO
Joined: 29 Mar 2007
Posts: 2559

### Show Tags

06 Oct 2007, 09:14
r019h wrote:
Is |x|>|y|?
1) x^2>y^2
2) x>y

Nice prob. I noticed a while back that essentially |x| is going to give the same result as x^2 in terms of negative/positive.

So S1 is suff.

S2: can be 3>2. So yes.

or can be -2>-3 So no.

So in terms of |x| and x^2, whenever you see something like this can think of the two as interchangable ONLY for determining the number as + or -. Its how I do it, and works fine. May confuse others.

A it is.
Re: gmatprep DS   [#permalink] 06 Oct 2007, 09:14
Display posts from previous: Sort by