BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

x+y

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Legendary Member
Posts: 1132
Joined: Mon Jul 20, 2009 3:38 am
Location: India
Thanked: 64 times
Followed by:6 members
GMAT Score:760

x+y

by harsh.champ » Fri Feb 19, 2010 7:47 am
Given that x and y are real numbers, what is the value of x + y ?

1. (x² - y²) / (x-y) = 7
2. (x + y)² = 49
It takes time and effort to explain, so if my comment helped you please press Thanks button :)



Just because something is hard doesn't mean you shouldn't try,it means you should just try harder.

"Keep Walking" - Johnny Walker :P
Top
Source: — Data Sufficiency |
User avatar
Newbie | Next Rank: 10 Posts
Posts: 2
Joined: Thu Feb 18, 2010 11:29 am

by gauravra025 » Fri Feb 19, 2010 7:59 am
1 is sufficient to answer this question
Top
User avatar
Legendary Member
Posts: 1560
Joined: Tue Nov 17, 2009 2:38 am
Thanked: 137 times
Followed by:5 members

by thephoenix » Fri Feb 19, 2010 9:40 am
harsh.champ wrote:Given that x and y are real numbers, what is the value of x + y ?

1. (x² - y²) / (x-y) = 7
2. (x + y)² = 49
s1) (x-y)(x+y)/(x-y)=x=y=7
suff

s2)taking sq root bth side
+/-(x+y)=7---->(x+y)=+/-7
not suff
hence A
Top
User avatar
Legendary Member
Posts: 1022
Joined: Mon Jul 20, 2009 11:49 pm
Location: Gandhinagar
Thanked: 41 times
Followed by:2 members

by shashank.ism » Sun Feb 21, 2010 7:04 am
harsh.champ wrote:Given that x and y are real numbers, what is the value of x + y ?

1. (x² - y²) / (x-y) = 7
2. (x + y)² = 49
St.1 ) (x² - y²) / (x-y) = 7 --> (x+y)(x-y)/(x-y) = 7 --> x+y =7 suff.
St.2 ) (x + y)² = 49 --> x+y =+/- 7 insuff.
Ans A
My Websites:
www.mba.webmaggu.com - India's social Network for MBA Aspirants

www.deal.webmaggu.com -India's online discount, coupon, free stuff informer.

www.dictionary.webmaggu.com - A compact free online dictionary with images.

Nothing is Impossible, even Impossible says I'm possible.
Top
Post new topic Post Reply
• Page 1 of 1