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

 It is currently 04 Jul 2015, 07:36

### 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

# m04 #24

Author Message
Senior Manager
Joined: 06 Aug 2011
Posts: 409
Followers: 2

Kudos [?]: 89 [0], given: 82

Re: m04 #24 [#permalink]  13 Oct 2012, 00:35
gmatchase wrote:
Quote:
Is $$x = 0$$ ?

1. $$xy = x$$
2. $$x + y = y$$

For Option1, which of the below method need to be followed?

Method1 ---- $$xy = x$$ ----> $$xy-x = 0$$ ----> $$x(y-1) = 0$$ ----> $$x = 0, y = 1$$ ---- I thought this method is always true in determining a value
Method2 ---- $$xy = x$$ - Substitute values $$x=0$$ & $$y$$can be any value? or $$x$$ can be any value and $$y=1?$$

both method are fine..

methode 1 is beter...

xy=x..y=1...and x is 0..
xy=x=both can b 1..1*1=1..so it cud be 1 or 0..

statement 2.X+y=y...Take y another side...then X=0..
_________________

Bole So Nehal.. Sat Siri Akal.. Waheguru ji help me to get 700+ score !

 Kaplan Promo Code Knewton GMAT Discount Codes Manhattan GMAT Discount Codes
Manager
Joined: 06 May 2012
Posts: 77
Followers: 2

Kudos [?]: 17 [0], given: 16

Re: m04 #24 [#permalink]  13 Oct 2012, 04:35
Hi Sanjoo, As you say we need to use the method1 to get one set of values and use method2 to look any other values are possible?
Intern
Joined: 15 May 2012
Posts: 41
Followers: 0

Kudos [?]: 5 [0], given: 94

Re: m04 #24 [#permalink]  14 Dec 2012, 10:48
I still don't understand why (1) is not sufficient. I agree that B by itself is sufficient enough. But with (1), how does it matter what the value of y is, x is equal to zero always, right? Please someone help.
Math Expert
Joined: 02 Sep 2009
Posts: 28272
Followers: 4472

Kudos [?]: 45171 [0], given: 6646

Re: m04 #24 [#permalink]  14 Dec 2012, 10:55
Expert's post
sharmila79 wrote:
I still don't understand why (1) is not sufficient. I agree that B by itself is sufficient enough. But with (1), how does it matter what the value of y is, x is equal to zero always, right? Please someone help.

No that's not correct. Notice that if y=1 then x can be any number. For more check here: m04-71403.html#p803443

Hope it helps.
_________________
Intern
Joined: 15 May 2012
Posts: 41
Followers: 0

Kudos [?]: 5 [0], given: 94

Re: m04 #24 [#permalink]  15 Dec 2012, 09:25
oops! forgot that fact... Thanks Bunuel!
Re: m04 #24   [#permalink] 15 Dec 2012, 09:25

Go to page   Previous    1   2   [ 25 posts ]

Similar topics Replies Last post
Similar
Topics:
M04 #24 1 04 May 2010, 15:16
m04q24 1 07 Sep 2009, 11:05
23 M04 # 32 15 22 Sep 2008, 18:43
3 m04 Q23 12 14 Sep 2008, 05:12
23 M04 #12 93 10 Aug 2008, 11:56
Display posts from previous: Sort by

# m04 #24

Moderators: Bunuel, WoundedTiger

 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®.