It is currently 18 Mar 2018, 23:38

### 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

# If ab is not equal to 0, and points (-a,b) and (-b,a) are in

Author Message
Intern
Joined: 23 Jun 2009
Posts: 47
If ab is not equal to 0, and points (-a,b) and (-b,a) are in [#permalink]

### Show Tags

24 Jul 2009, 13:20
00:00

Difficulty:

(N/A)

Question Stats:

100% (00:02) correct 0% (00:00) wrong based on 14 sessions

### HideShow timer Statistics

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

If ab is not equal to 0, and points (-a,b) and (-b,a) are in the same quadrant of the xy-plane, is point (-x,y) in this same quadrant?

1) xy > 0
2) ax > 0

Thanks a lot. It's from the GMATPrep Software.
Current Student
Joined: 12 Jun 2009
Posts: 1793
Location: United States (NC)
Concentration: Strategy, Finance
Schools: UNC (Kenan-Flagler) - Class of 2013
GMAT 1: 720 Q49 V39
WE: Programming (Computer Software)

### Show Tags

24 Jul 2009, 13:41
1
KUDOS
uzonwagba wrote:
If ab is not equal to 0, and points (-a,b) and (-b,a) are in the same quadrant of the xy-plane, is point (-x,y) in this same quadrant?

1) xy > 0
2) ax > 0

Thanks a lot. It's from the GMATPrep Software.

for the 2 to be in same quadrant they must have equal signs so a,b is either +,+ or -,-.

1) INSUFF. Since that means both x and y have same signs (--/++) but we dont know which quadrant it is?
2) INSUFF. we know nothing about Y

C - if we combine them we know X*Y>0 so they have same signs. Now since A*X>0 that means X's sign is same as A's so we know (-x,y) is in same quadrant?>
_________________

Intern
Joined: 23 Jun 2009
Posts: 47

### Show Tags

24 Jul 2009, 13:45
Thanks! I appreciate you!
Re: (Help) DS Problem #1: Please take a stab, anyone!   [#permalink] 24 Jul 2009, 13:45
Display posts from previous: Sort by