Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 18 May 2013, 17:08
Customize  |  Hide

Search
Register
New posts
Unanswered

Coordinate Geometry

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Senior Manager
Senior Manager
Joined: 20 Feb 2008
Posts: 299
Location: Bangalore, India
Schools: R1:Cornell, Yale, NYU. R2: Haas, MIT, Ross
Followers: 4

Kudos [?]: 18 [0], given: 0

GMAT Tests User
Coordinate Geometry [#permalink] New post 04 May 2008, 14:52
Could you please provide an explanation for this question, I think I am missing an obvious point here.
Thank you.
Attachments

GMAT Prep 1 Coordinate Geometry.doc [112 KiB]
Downloaded 46 times

To download please login or register as a user

VP
VP
Joined: 10 Jun 2007
Posts: 1478
Followers: 5

Kudos [?]: 70 [0], given: 0

GMAT Tests User
Re: Coordinate Geometry [#permalink] New post 04 May 2008, 15:12
ventivish wrote:
Could you please provide an explanation for this question, I think I am missing an obvious point here.
Thank you.


C for me.

L = m1*x + b1
K = m2 *x + b2

We want to find if m1*m2<0 ?

(1) is given that product of x intercepts is positive
To find x-intercept, set y=0.
For line L: x = -b1/m1
For line K: x = -b2/m2
So we know that
(b1/m1)*(b2/m2) >0
In this case, we don't know b1 or b2, so INSUFFICIENT

(2) is given that product of y intercepts is negative
To find y-intercept, set x=0
For line L: y = b1
For line K: y = b2
So we know that
b1*b2 < 0
Don't know anything about slopes, INSUFFICIENT

Together, we know that
(b1*b2) / (m1*m2) > 0 AND b1*b2 < 0
This means that
m1 * m2 must be negative.
SUFFICIENT
Senior Manager
Senior Manager
Joined: 20 Feb 2008
Posts: 299
Location: Bangalore, India
Schools: R1:Cornell, Yale, NYU. R2: Haas, MIT, Ross
Followers: 4

Kudos [?]: 18 [0], given: 0

GMAT Tests User
Re: Coordinate Geometry [#permalink] New post 04 May 2008, 17:07
Thank you !!!Makes sense now.
Re: Coordinate Geometry   [#permalink] 04 May 2008, 17:07
    Similar topics Author Replies Last post
Similar
Topics:
 New posts Coordinate geometry Jennif102 3 08 Nov 2005, 22:15
New posts Coordinate geometry vd 1 19 Jun 2008, 04:58
New posts 1 Coordinate Geometry agdimple333 3 25 May 2011, 12:09
New posts EXPERTS_POSTS_IN_THIS_TOPIC Coordinate Geometry kichha51 2 03 Jun 2011, 09:23
Display posts from previous: Sort by

Coordinate Geometry

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com