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

 It is currently 06 Jul 2015, 09:57

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

In the xy-plane, does the line w/ equation y=3x+2 contain

Author Message
TAGS:
Intern
Joined: 14 Jul 2005
Posts: 44
Location: California
Followers: 1

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

In the xy-plane, does the line w/ equation y=3x+2 contain [#permalink]  01 Jan 2007, 11:29
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
In the xy-plane, does the line w/ equation y=3x+2 contain the point (r,s)?
(1) (3r+2-s) (4r+9-s) = 0
(2) (4r-6-s) (3r+2-s) = 0

This question has been posted before but I am still confused on the explanation.
Senior Manager
Joined: 23 Jun 2006
Posts: 387
Followers: 1

Kudos [?]: 311 [0], given: 0

for (r,s) to be on the line y=3x+2 it is necessary and sufficient that 2=3r+2 => 3r+2-s=0

from st1 we know that either (3r+2-s)=0 or (4r+9-s)=0 so it is insufficient.
from st2 we know that either (3r+2-s)=0 or (4r-6-s)=0 so it is insufficient.

taking them together is sufficient. it can't be that both 4r+9-s=0 and 4r-6-s=0. so it must be that 3r+2-s=0

hence C.
Intern
Joined: 14 Jul 2005
Posts: 44
Location: California
Followers: 1

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

Thanks Hobbit... Just figured out the explanation, right after I posted the question.
Was confused about whether s=3r+2 and y=3x+2 are the same line
Similar topics Replies Last post
Similar
Topics:
1 In xy-plane, does line with equation y = 3x+2 contain the 3 12 May 2009, 16:34
1 In the xy-plane, does the line with equation y=3x+2 contain 7 06 Jul 2008, 08:24
In the xy-plane, does the line with equation y=3x+2 contains 4 25 Nov 2007, 22:24
In the xy-plane, does the line w/ equation y=3x+2 contain 1 04 Nov 2006, 18:53
In the xy-plane, does the line with equation y=3x+2 contain 3 07 Dec 2005, 19:32
Display posts from previous: Sort by

In the xy-plane, does the line w/ equation y=3x+2 contain

 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®.