NEW HERE? LEARN MORE
closeclose
Last visit was: 26 Apr 2024, 20:29 It is currently 26 Apr 2024, 20:29
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

Is x > y? (1) 9x = 4y (2) x = -y

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
B
GMATT73
CEO
CEO
Joined: 29 Jan 2005
Posts: 2887
Own Kudos [?]: 1117 [22]
Given Kudos: 0
Send PM
Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   Updated on: 05 Nov 2020, 06:37
3
Kudos
19
Bookmarks
00:00
A
B
C
D
E

Difficulty:

75% (hard)

Question Stats:

50% (01:47) correct 50% (01:37) wrong based on 511 sessions
Hide Show timer Statistics
Is x > y?

(1) 9x = 4y
(2) x = -y
ShowHide Answer
Official Answer
C

Originally posted by GMATT73 on 02 Dec 2005, 06:37.
Last edited by Bunuel on 05 Nov 2020, 06:37, edited 2 times in total.
Renamed the topic, edited the question and the OA.
Most Helpful Reply
User avatar
Vyacheslav
Intern
Intern
Joined: 25 Oct 2009
Posts: 14
Own Kudos [?]: 66 [8]
Given Kudos: 12
Concentration: Finance
Schools:Wharton, HBS, Stanford
 Q50  V35
Send PM
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   31 Oct 2009, 15:01
6
Kudos
2
Bookmarks
(1) 9x=4y
Restating statement, we receive x=4/9y,
4/9y<y, while y>0, and
4/9y>y, while y<0. While we cannot determine sign of x or y, (1) alone is NOT SUFFICIENT.

(2) x=-y
x>y for all x>0, and
x<y for all x<0. But again sign of x or y is not known. So, (2) alone is NOT SUFFICIENT.

Both statements together could be true only if x=y=0.

Answer should be C.

KUDOS if you find it helpful ;)
General Discussion
User avatar
AKProdigy87
Manager
Manager
Joined: 11 Sep 2009
Posts: 81
Own Kudos [?]: 1005 [1]
Given Kudos: 6
Send PM
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   31 Oct 2009, 15:04
1
Kudos
Statement 1: 9x = 4y

x = (4/9)y

Therefore,

If y < 0: x > y
If y > 0: x < y
If y = 0: x = y

Insufficient.

Statement 2: x = -y

If y < 0: x > y
If y > 0: x < y
If y = 0: x = y

Insufficient.

Both Statements Together

(1) 9x = 4y
(2) x = -y

It should be apparent that this is only true iff x = y = 0. Therefore, sufficient!

The answer is C.
User avatar
mbaiseasy
Senior Manager
Senior Manager
Joined: 13 Aug 2012
Posts: 336
Own Kudos [?]: 1822 [1]
Given Kudos: 11
Concentration: Marketing, Finance
Schools: Full Time MBA (A$)
GPA: 3.23
Send PM
GMAT ToolKit User
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   17 Jan 2013, 00:29
1
Kudos
slingfox wrote:
Is x > y?

1. 9x = 4y
2. x = -y


Thank you for this question. here is my solution.

1. \(9x=4y\) also means:
(a) \(\frac{x}{y}=\frac{4}{9}\) which means y > x NO!
(b) \(\frac{x}{y}=\frac{{-4}}{{-9}}\) which means x > y YES!
INSUFFICIENT!

2. \(\frac{x}{y}=-1\) this means:
(a) they have the same number but of different sign, one is negative the other is positive BUT we don't know which one is positive or negative
(b) x = y = 0
INSUFFICIENT!

Combine both:
\(9(-y) = 4y\)
\(13y = 0\)
\(y=0\) and \(x=0\)

Answer: C
User avatar
L
egmat
e-GMAT Representative
Joined: 02 Nov 2011
Posts: 4349
Own Kudos [?]: 30802 [3]
Given Kudos: 637
GMAT Date: 08-19-2020
Send PM
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   17 Jan 2013, 01:35
2
Kudos
1
Bookmarks
Expert Reply
slingfox wrote:
Is x > y?

1. 9x = 4y
2. x = -y

Another simpler approach could be...

Statement 1-

Say x= 4, & y=9 => x<y => NO.
But if x= -4, & y=-9 => x>y => Yes.

Insufficient

Statement 2-

Say x= 1, & y=-1 => x>y => Yes.
But if x= -1, & y=1 => x<y => No.

Insufficient

Statement 1, & 2 together-

Only one case is possible => x=y=0. Answer C.

-Shalabh Jain
User avatar
DensetsuNo
Manager
Manager
Joined: 11 Oct 2015
Status:2 months to go
Posts: 91
Own Kudos [?]: 857 [1]
Given Kudos: 38
Schools: HBS 2+2 '22 MIT Sloan MSMS"18
GMAT 1: 730 Q49 V40
GPA: 3.8
Send PM
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   21 Jul 2016, 07:46
1
Kudos
GMATT73 wrote:
Is x > y?

(1) 9x = 4y
(2) x = -y



1) NS
if x=4 & y=9 the statement is sufficient;
but if x=9 & y=4 the statement is insufficient;

2) NS
if \(x=-y\) is \(-y>y\)?
It depends on whether y is negative.

T) S
Is y negative? \(-y > y\),
substitute in the second prompt and we get \(\frac{x}{y}=\frac{4}{9}\) -> \(\frac{-y}{y}=\frac{4}{9}\) -> \(-1=\frac{4}{9}\)
-> Impossible: y is never negative and x>y is never true.

Answer C.
User avatar
L
GMATBusters
GMAT Tutor
Joined: 27 Oct 2017
Posts: 1905
Own Kudos [?]: 5582 [0]
Given Kudos: 236
WE:General Management (Education)
Send PM
GMAT ToolKit User
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   02 Jun 2018, 03:36
Expert Reply
Is x > y?

(1) 9x = 4y
(2) x = -y

If we observe both equations,
from 1st equation, both x and y have same sign
from 2nd equation, both x and y have opposite sign.
hence this is possible only when both x and y = 0

hence Combination of both statements is the sufficient, and Answer to question stem (Is x > y?) is No,

Answer C
User avatar
P
rahul16singh28
Senior Manager
Senior Manager
Joined: 31 Jul 2017
Posts: 435
Own Kudos [?]: 443 [0]
Given Kudos: 752
Location: Malaysia
Schools: INSEAD Jan '19
GPA: 3.95
WE:Consulting (Energy and Utilities)
Send PM
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   Updated on: 02 Jun 2018, 08:42
GMATT73 wrote:
Is x > y?

(1) 9x = 4y
(2) x = -y


1 & 2 Alone are not sufficient.. Combining the two, we get -

\(9(x+y) = 13y\)

From Statement II, \(x + y = 0\)

So, \(9 * 0 = 13y\)

\(y =0, x = 0.\)

Hence, C.

Originally posted by rahul16singh28 on 02 Jun 2018, 04:19.
Last edited by rahul16singh28 on 02 Jun 2018, 08:42, edited 1 time in total.
User avatar
L
GMATBusters
GMAT Tutor
Joined: 27 Oct 2017
Posts: 1905
Own Kudos [?]: 5582 [0]
Given Kudos: 236
WE:General Management (Education)
Send PM
GMAT ToolKit User
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   02 Jun 2018, 04:23
Expert Reply
hi

\(9(x+y) = 13y\)
what makes u conclude \(y =0, x = 0.\)
Reasoning is more important than the answer.

rahul16singh28 wrote:
GMATT73 wrote:
Is x > y?

(1) 9x = 4y
(2) x = -y


1 & 2 Alone are not sufficient.. Combining the two, we get -

\(9(x+y) = 13y\)
\(y =0, x = 0.\)

Hence, C.
User avatar
P
rahul16singh28
Senior Manager
Senior Manager
Joined: 31 Jul 2017
Posts: 435
Own Kudos [?]: 443 [0]
Given Kudos: 752
Location: Malaysia
Schools: INSEAD Jan '19
GPA: 3.95
WE:Consulting (Energy and Utilities)
Send PM
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   02 Jun 2018, 05:30
gmatbusters wrote:
hi

\(9(x+y) = 13y\)
what makes u conclude \(y =0, x = 0.\)
Reasoning is more important than the answer.

rahul16singh28 wrote:
GMATT73 wrote:
Is x > y?

(1) 9x = 4y
(2) x = -y


1 & 2 Alone are not sufficient.. Combining the two, we get -

\(9(x+y) = 13y\)
\(y =0, x = 0.\)

Hence, C.


Hi gmatbusters

From Statement 1, we can write -
\(9(x+y) = 13y\)

From Statement B -
\(x + y = 0\)

So, we have by combining two statements -

\(9(x+y) = 13y\) or
\(9*0 = 13y\)

\(y = 0, x = 0\)
User avatar
L
GMATBusters
GMAT Tutor
Joined: 27 Oct 2017
Posts: 1905
Own Kudos [?]: 5582 [0]
Given Kudos: 236
WE:General Management (Education)
Send PM
GMAT ToolKit User
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   02 Jun 2018, 08:26
Expert Reply
yes, this is a complete explanation. :thumbup:

rahul16singh28 wrote:
hi

\(9(x+y) = 13y\)
what makes u conclude \(y =0, x = 0.\)
Reasoning is more important than the answer.

rahul16singh28 wrote:
GMATT73 wrote:
Is x > y?

(1) 9x = 4y
(2) x = -y


1 & 2 Alone are not sufficient.. Combining the two, we get -

\(9(x+y) = 13y\)
\(y =0, x = 0.\)

Hence, C.


Hi gmatbusters

From Statement 1, we can write -
\(9(x+y) = 13y\)

From Statement B -
\(x + y = 0\)

So, we have by combining two statements -

\(9(x+y) = 13y\) or
\(9*0 = 13y\)

\(y = 0, x = 0\)[/quote]
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32691
Own Kudos [?]: 822 [0]
Given Kudos: 0
Send PM
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink] New post   19 Jan 2024, 16:04
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
GMAT Club Bot
gmatclubot
Re: Is x > y? (1) 9x = 4y (2) x = -y [#permalink]
19 Jan 2024, 16:04
Moderator:
Bunuel
Math Expert
92948 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions