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

It is currently 30 Oct 2014, 20:02

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

y=mx+b, Does the line pass thru the negative x axis? 1. m+b

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 11 Jun 2006
Posts: 254
Followers: 3

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

y=mx+b, Does the line pass thru the negative x axis? 1. m+b [#permalink] New post 03 Jun 2007, 13:50
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
y=mx+b, Does the line pass thru the negative x axis?

1. m+b > 1

2. mb > 0
Director
Director
User avatar
Joined: 26 Feb 2006
Posts: 907
Followers: 4

Kudos [?]: 44 [0], given: 0

Re: DS XY plane [#permalink] New post 03 Jun 2007, 16:55
baer wrote:
y=mx+b, Does the line pass thru the negative x axis?
1. m + b > 1
2. mb > 0


we need m and b to find whether the line pass through -ve x axis.

from i: either m and b both +ve or one is +ve and the other one is -ve. also the positive is grater than the absolute value of the -ve one. so not suuf cuz we do not know which is +ve and which is -ve.nsf./

from ii: eithe both -ve or both +ve. nsf/.

from i and ii: both are +ve i,e. the slope is +ve and y intercept is also +ve as well.

so C.
Senior Manager
Senior Manager
avatar
Joined: 11 Jun 2006
Posts: 254
Followers: 3

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

 [#permalink] New post 03 Jun 2007, 17:29
I'm thinking it's B.

I'm testing plugging in values where m and b are both negative or positive to y=mx+b and I can't come up with a situation where there isn't a negative x intercept.

y=mx+b
0=-1(-1)+-1
Manager
Manager
avatar
Joined: 28 Aug 2006
Posts: 160
Followers: 2

Kudos [?]: 12 [0], given: 0

 [#permalink] New post 03 Jun 2007, 17:59
Answer is B

Since m*c>0
=> m and C are +ve or m and C are -ve in both cases the line has to passes through -ve X axis. Hence sufficient condition.
Intern
Intern
avatar
Joined: 23 Apr 2007
Posts: 13
Followers: 0

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

correct way [#permalink] New post 04 Jun 2007, 10:07
Here we have to find that whether line intersect at negative X-axis this means y=0 => x=-b/m

(1) says m+b>1 means atleast one of them is positive so answer can't be exactly determined
(2) mb>0 this means either both are positive or negative so again answer can't be exactly detemined

combining both these statements we can get the ansewr.
correct way   [#permalink] 04 Jun 2007, 10:07
    Similar topics Author Replies Last post
Similar
Topics:
5 Experts publish their posts in the topic Does line y = mx + c intersect X axis? jellybean23 5 26 Sep 2013, 22:58
2 Experts publish their posts in the topic Does line Ax + By + C = 0 (A is not 0) intersect the x-axis bmwhype2 7 02 Dec 2007, 02:59
IN the xy-plane, the line k passes thru the origin and thru gmacvik 3 15 Sep 2006, 16:17
Does the line represented by ax^2+bx+c intersect the x-axis? joemama142000 2 21 Feb 2006, 16:11
What is the equation of the line that passes thru (1,1) and joemama142000 10 20 Feb 2006, 17:31
Display posts from previous: Sort by

y=mx+b, Does the line pass thru the negative x axis? 1. m+b

  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®.