Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 28 May 2017, 11:41

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 xy plane, does the line with equation y=3x+2 contain

Author Message
Senior Manager
Joined: 20 Feb 2006
Posts: 373
Followers: 1

Kudos [?]: 29 [0], given: 0

In xy plane, does the line with equation y=3x+2 contain [#permalink]

Show Tags

16 Sep 2006, 18:18
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

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

In xy plane, does the line with equation y=3x+2 contain point (r,s)?

1) (3r + 2 - s)(4s + 9 - s) = 0

2) (4r - 6 - s)(3r + 2 - s) = 0

(edited)

Last edited by MBAlad on 17 Sep 2006, 05:55, edited 1 time in total.
Manager
Joined: 22 Aug 2006
Posts: 56
Location: Moscow, Russia
Followers: 1

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

Re: GMAT prep - Tough DS [#permalink]

Show Tags

17 Sep 2006, 05:20
In xy plane, does the line with equation y=3x+2 contain point (r,s)?

1) (3r + 2 - s)(4s + 9 - s) = 0

2) (4r - 6 - s)(3r + 2 - 5) = 0

1. SUFFICIENT:,
3r +2 = s
3x +2 = y
are essentially the same equation so any (r;s) solves the stem equation

2. INSUFFICIENT

s = 4r-6 only crosses y = 3x+2 at one point (9;26)

_________________

________________________________
"Amicus Plato, sed magic amica veritas"

Senior Manager
Joined: 20 Feb 2006
Posts: 373
Followers: 1

Kudos [?]: 29 [0], given: 0

Show Tags

17 Sep 2006, 05:24
Can you also tell me how you calculated the points at which the lines intersect?
Senior Manager
Joined: 28 Aug 2006
Posts: 304
Followers: 13

Kudos [?]: 153 [0], given: 0

Re: GMAT prep - Tough DS [#permalink]

Show Tags

17 Sep 2006, 05:44
In xy plane, does the line with equation y=3x+2 contain point (r,s)?

1) (3r + 2 - s)(4s + 9 - s) = 0

2) (4r - 6 - s)(3r + 2 - 5) = 0

Hey MBAlad, i guess the second condition must be (4r-6-s)(3r+2-s)=0
Then only the answer will be C

From 1 : (3r+2-s)(4s+9-s)=0 means

(3r+2-s) = 0 or ((4s+9-s) = 0

If (3r+2-s) = 0 then the line passes through (r,s).
If we consider the second case we can't determine.

Similarly From 2: also we get the same answer.

Combining both we can conclude that 1 and 2 will be equal to 0 provided only (3r+2-s) = 0 and hence the answer is C.

But i think the correction must be there in stat 2 as i mentioned earlier
_________________

Last edited by cicerone on 25 Sep 2008, 01:09, edited 1 time in total.
Senior Manager
Joined: 20 Feb 2006
Posts: 373
Followers: 1

Kudos [?]: 29 [0], given: 0

Show Tags

17 Sep 2006, 05:56
Yes sorry, have edited the original.

Would you mind expanding on your reasoning and say how you know the lines intersect and how you calculate this?

Thanks
17 Sep 2006, 05:56
Display posts from previous: Sort by