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

It is currently 19 May 2013, 12:44
Customize  |  Hide

Search
Register
New posts
Unanswered

M03 #15

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
VP
VP
User avatar
Status: The last round
Joined: 18 Jun 2009
Posts: 1327
Concentration: Strategy, General Management
Schools: Stanford '14 (D), Booth '14 (D), Johnson '14 (D)
GMAT 1: 680 Q48 V34
Followers: 43

Kudos [?]: 383 [0], given: 156

GMAT ToolKit User GMAT Tests User
M03 #15 [#permalink] New post 09 Jul 2010, 03:37
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If two lines have slopes m and n , respectively, are they perpendicular?

1. m*n=-1
2. m=-n

I have an issue in OE when explaining the statement 2. From OE shown below one can still answer the question that whether m & n are perpendicular.

I think in OE there should be two examples. First an example of two lines y= x+10 & y=-x+10, here you can see that the lines are parallel as the product of their slope is -1. In second example we can quote y=10x & y=-10x. Now its make more sense that statement 2 is insufficient.


OE:
Statement (2) by itself is insufficient. We only know that the lines have reciprocal slopes. For example line y=10x and y=-10x , are mirror reflections of each other on the x axis, but not perpendicular.
_________________

[ From 470 to 680-My Story ] [ My Last Month Before Test ]
[ GMAT Prep Analysis Tool ] [ US. Business School Dashboard ] [ Int. Business School Dashboard ]

I Can, I Will

Find out what's new at GMAT Club - latest features and updates

Manager
Manager
User avatar
Joined: 06 Oct 2009
Posts: 70
Followers: 2

Kudos [?]: 19 [0], given: 5

Re: M03 #15 [#permalink] New post 09 Jul 2010, 21:14
Statement-1:
We know that if two lines are perpendicular to each other, their slopes will be negative reciprocal to each other.
So here m*n= -1 => m = -1/n (Hence SUFFICIENT)

Statement-2:
m=-n
They can be negative reciprocal for some numbes(like 1) but not for others.(Hence NOT SUFFICIENT)

Ans : A

OA?
_________________

+1 kudos me if this is of any help...

1 KUDOS received
Intern
Intern
Joined: 11 Apr 2010
Posts: 22
Followers: 0

Kudos [?]: 1 [1] , given: 11

Re: M03 #15 [#permalink] New post 15 Jul 2010, 12:30
1
This post received
KUDOS
Shouldn't statement 2 be sufficient because the lines are never going to be perpendicular.??
Intern
Intern
Joined: 21 Jun 2010
Posts: 3
Followers: 0

Kudos [?]: 0 [0], given: 3

Re: M03 #15 [#permalink] New post 15 Jul 2010, 13:53
flash wrote:
Shouldn't statement 2 be sufficient because the lines are never going to be perpendicular.??


@flash
Nope . see the first reply.
eg: m=1 , n = -1 .
That could be one of the answers. So not sufficient with stmt 2.
Intern
Intern
Joined: 11 Apr 2010
Posts: 22
Followers: 0

Kudos [?]: 1 [0], given: 11

Re: M03 #15 [#permalink] New post 15 Jul 2010, 14:09
aaah...got ya. tks
Re: M03 #15   [#permalink] 15 Jul 2010, 14:09
    Similar topics Author Replies Last post
Similar
Topics:
 Popular new posts 1 m03 - #7 Liquid 13 28 Feb 2008, 22:12
Popular new posts M03 #19 jjhko 25 15 Sep 2008, 12:36
Popular new posts 17 M03 #01 dczuchta 41 19 Sep 2008, 17:06
Popular new posts 1 EXPERTS_POSTS_IN_THIS_TOPIC m03 #15 vaivish1723 20 31 Jul 2009, 01:21
New posts m03 #15 DYNAMITE 4 13 Jul 2011, 09:36
Display posts from previous: Sort by

M03 #15

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderator: Bunuel

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