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

Redeem

X and Y

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
User avatar
Master | Next Rank: 500 Posts
Posts: 324
Joined: Mon Jul 05, 2010 6:44 am
Location: London
Thanked: 70 times
Followed by:3 members

by kmittal82 » Fri Oct 08, 2010 4:57 am
Stmt1)

x > 4, y > 0

According to the equation, the bigger y is, the lesser the "-3y" quantity becomes, and for x>4, x^2 will always be greater than 4x

Sufficient

stmt2)

4x - 3y = -1, so the question is asking is x^2 > -1. Sqaure of any number is greater than -1, so sufficient.

So, in my opinion, it should be (D)
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 1179
Joined: Sun Apr 11, 2010 9:07 pm
Location: Milpitas, CA
Thanked: 447 times
Followed by:88 members

by Rahul@gurome » Fri Oct 08, 2010 5:04 am
(1) If x = 5 and y = 1, then x^2 = 25 and 4x - 3y = 17; here x^2 > 4x - 3y.
If x = 5 and y = 10, then x^2 = 25 and 4x - 3y = -10; here x^2 > 4x - 3y.
Similarly, we can see that for various values of x, x^2 > 4x - 3y.
So, (1) is SUFFICIENT.

(2) x^2 will always be positive and 4x - 3y = -1. So, x^2 > 4x - 3y
So, (2) is SUFFICIENT.
[spoiler]
The correct answer is (D).[/spoiler]
Rahul Lakhani
Quant Expert
Gurome, Inc.
https://www.GuroMe.com
On MBA sabbatical (at ISB) for 2011-12 - will stay active as time permits
1-800-566-4043 (USA)
+91-99201 32411 (India)
Top
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 am
Location: India
Thanked: 267 times
Followed by:80 members
GMAT Score:760

by sanju09 » Fri Oct 08, 2010 5:05 am
goyalsau wrote:Is x2 > 4x - 3y?

(1) y > 0 and x > 4

(2) 4x - 3y = -1

D
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Post new topic Post Reply
• Page 1 of 1