Is x^2>y^2?
1) x<y
2) -y>x
*An answer will be posted in 2 days.
Is x^2>y^2?
This topic has expert replies
- Max@Math Revolution
- Elite Legendary Member
- Posts: 3991
- Joined: Fri Jul 24, 2015 2:28 am
- Location: Las Vegas, USA
- Thanked: 19 times
- Followed by:37 members
Math Revolution
The World's Most "Complete" GMAT Math Course!
Score an excellent Q49-51 just like 70% of our students.
[Free] Full on-demand course (7 days) - 100 hours of video lessons, 490 lesson topics, and 2,000 questions.
[Course] Starting $79 for on-demand and $60 for tutoring per hour and $390 only for Live Online.
Email to : [email protected]
-
- Master | Next Rank: 500 Posts
- Posts: 199
- Joined: Sat Apr 26, 2014 10:53 am
- Thanked: 16 times
- Followed by:4 members
- GMAT Score:780
(1) Not suffiient. x = -3, y = 1, answer to prompt: YES; x = 1, y = 3, answer to prompt: NOMax@Math Revolution wrote:Is x^2>y^2?
1) x<y
2) -y>x
*An answer will be posted in 2 days.
(2) Not sufficient. x = 2, y = -3, answer to prompt: NO; x = -3, y = 2; answer to prompt: YES
Combined (1) & (2): +/-y > x --> Implies x must be a negative number with an absolute value greater than y, since y is greater than x even if we multiple it by -1. Since |x| > |y|, the prompt question must always be true. Answer: C
800 or bust!
- Max@Math Revolution
- Elite Legendary Member
- Posts: 3991
- Joined: Fri Jul 24, 2015 2:28 am
- Location: Las Vegas, USA
- Thanked: 19 times
- Followed by:37 members
From the original condition, we can see that there are 2 variables. Hence, the correct answer is C.
- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
Math Revolution
The World's Most "Complete" GMAT Math Course!
Score an excellent Q49-51 just like 70% of our students.
[Free] Full on-demand course (7 days) - 100 hours of video lessons, 490 lesson topics, and 2,000 questions.
[Course] Starting $79 for on-demand and $60 for tutoring per hour and $390 only for Live Online.
Email to : [email protected]