Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2308:00 PM PDT
-09:00 PM PDT
Video explanations + diagnosis of 10 weakest areas + 150+ short videos + study plan!
Apr 2301:30 AM EDT
-02:30 AM EDT
Struggling with GMAT Verbal as a non-native speaker? Harsh improved his score from 595 to 695 in just 45 days—and scored a 99 %ile in Verbal (V88)! Learn how smart strategy, clarity, and guided prep helped him gain 100 points.
Apr 2512:30 AM EDT
-01:30 AM EDT
At one point, she believed GMAT wasn’t for her. After scoring 595, self-doubt crept in and she questioned her potential. But instead of quitting, she made the right strategic changes. The result? A remarkable comeback to 695. Check out how Saakshi did it.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
18 May 2021, 07:37
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
87% (01:01) correct
13%
(00:55)
wrong
based on 231
sessions
History
Date
Time
Result
Not Attempted Yet
If x > 0 and y < 0, which of the following must be true?
(A) x + y > 0
(B) x^2 - y^2 > 0
(C) y^2 - x > 0
(D) y + x^2 > 0
(E) none of these
(A) x + y > 0
(B) x^2 - y^2 > 0
(C) y^2 - x > 0
(D) y + x^2 > 0
(E) none of these
19 May 2021, 00:51
Kudos
Bookmarks
A good question to understand the technique of using simple values to solve Must be questions.
Remember that, in a Must Be true question, we take values and try to prove every option FALSE. If you proved an option FALSE, you proved that it is not always true and hence the option can be eliminated. The option remaining at the end of this process will be the correct answer.
Let’s consider x = 1 and y = -1. Using these values, let us evaluate the answer options.
x + y = 0, therefore, answer option A is false. Eliminate.
\(x^2\) – \(y^2\) = 0, therefore, answer option B is false. Eliminate.
\(y^2\) – x > 0, therefore, answer option C is false. Eliminate.
y + \(x^2\) > 0, therefore, answer option D is false. Eliminate.
This means that none of the options A, B C or D are always true.
The correct answer option is E.
A smart technique to plug values in GMAT Quant questions is to use the number line. Divide the number line into 4 standard intervals namely, 0 to 1, 1 to infinity, 0 to -1 and -1 to –infinity. Pick different types of numbers – integers, fractions, roots – from all intervals. But more importantly, do not forget to start off with ZERO, ONE and -1 because these are values that will help you answer a lot of questions.
Hope that helps!
Aravind BT
Remember that, in a Must Be true question, we take values and try to prove every option FALSE. If you proved an option FALSE, you proved that it is not always true and hence the option can be eliminated. The option remaining at the end of this process will be the correct answer.
Let’s consider x = 1 and y = -1. Using these values, let us evaluate the answer options.
x + y = 0, therefore, answer option A is false. Eliminate.
\(x^2\) – \(y^2\) = 0, therefore, answer option B is false. Eliminate.
\(y^2\) – x > 0, therefore, answer option C is false. Eliminate.
y + \(x^2\) > 0, therefore, answer option D is false. Eliminate.
This means that none of the options A, B C or D are always true.
The correct answer option is E.
A smart technique to plug values in GMAT Quant questions is to use the number line. Divide the number line into 4 standard intervals namely, 0 to 1, 1 to infinity, 0 to -1 and -1 to –infinity. Pick different types of numbers – integers, fractions, roots – from all intervals. But more importantly, do not forget to start off with ZERO, ONE and -1 because these are values that will help you answer a lot of questions.
Hope that helps!
Aravind BT
27 Nov 2023, 23:53
Kudos
Bookmarks
Emdad
Here, we do not know the magnitude of x or y.
a) x+y>0...no, we don't know whether |y|>x
b) x^2 - y^2 > 0, again if |y|<x, this will hold false
c) y^2-x >0, Oh nice, both positive numbers...but no, what if x> y^2
d) y + x²> 0.... No dear, what if |y|>x^2
Therefore finally, option E; none of these is the answer.
