Find all School-related info fast with the new School-Specific MBA Forum

It is currently 29 Aug 2014, 04:22

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Is xy>0? 1) x-y>-2 2) x-2y<-6 OA is C. Can anyone

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 23 May 2007
Posts: 7
Followers: 0

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

Is xy>0? 1) x-y>-2 2) x-2y<-6 OA is C. Can anyone [#permalink] New post 15 Jan 2009, 19:56
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Is xy>0?

1) x-y>-2
2) x-2y<-6

OA is C. Can anyone explain why?
Intern
Intern
avatar
Joined: 05 Jan 2009
Posts: 10
Followers: 0

Kudos [?]: 4 [0], given: 0

Re: DS- Number property [#permalink] New post 16 Jan 2009, 00:33
I think it is quite obvious that a and b are not suff but themselves (you can find plenty of cases to see it). So let's joint the 2 inequalities and see what happen:

x-y>-2
x-2y<-6
This is the same as:
x-y>-2
-x+2y>6
The result of combining both is: y>4
We can use the first inequality now: x-4>-2; x>2
So the answer is C because we know that combining both ineq. y>4 and x>2 so xy>0
Intern
Intern
avatar
Joined: 16 Jan 2009
Posts: 14
Followers: 1

Kudos [?]: 11 [0], given: 0

Re: DS- Number property [#permalink] New post 16 Jan 2009, 16:43
Is xy>0?

1) x-y>-2
2) x-2y<-6

OA is C. Can anyone explain why?

Its a yes/no question.
xy>0 implies that xy is positive which means either x and y both should be positive or x and y both should be negative.

statement1. x - y > - 2 or x > y - 2
if y = -1 then x could be -2 which gives yes
if y = -1 then x could be 3 which gives No
so statement 1 is insufficient

statement2. similarly statement2 is also insufficient.

Taking together

two inequalities ....add them ( change the inequality of the second statement to - x + 2y > 6) we get

y > 4 ( so y is positive)

now in statement1 if y > 4 then x > 2 ....so Yes xy > 0 since x and y both positive
in statement 2 if y > 4 then x > 2 ... so Yes xy> 0 .

so the answer is C .

www.graduatetutor.com
Re: DS- Number property   [#permalink] 16 Jan 2009, 16:43
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic Is xy > 0? 1) x-y > -2 2) x-2y < -6 Would you utgirl826 16 05 Jun 2008, 08:24
is xy >0 1) x-y > -2 2 ) x-2y < -6 Balvinder 5 05 Aug 2007, 23:06
Is xy > 0 ? (1) x-y > -2 (2) x - 2y < -6 sumande 4 02 Aug 2007, 07:41
xy>0? 1. x-y>-2 2.x-2y<-6 OA: E overtherainbow 1 01 Apr 2007, 16:55
Is xy> 0? (1) x -y > -2 (2) x-2y < -6 (OA may be anandsebastin 1 28 Oct 2006, 14:33
Display posts from previous: Sort by

Is xy>0? 1) x-y>-2 2) x-2y<-6 OA is C. Can anyone

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.