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y = |y| and y = -|y|

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GMAT Club Legend
GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1654 [0], given: 396

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y = |y| and y = -|y| [#permalink] New post 27 Oct 2016, 12:27
Expert's post
00:00

Question Stats:

42% (00:21) correct 57% (00:49) wrong based on 14 sessions
\(y = |y|\)
\(y = -|y|\)


Quantity A
Quantity B
y
0


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.


Drill 2
Question: 10
Page: 287-288
[Reveal] Spoiler: OA

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Sandy
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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1654 [0], given: 396

CAT Tests
Re: y = |y| and y = -|y| [#permalink] New post 27 Oct 2016, 12:28
Expert's post
Explanation

The first equation tells you that y cannot be a negative number. The second equation tells you that y cannot be a positive number. Therefore, y must be 0.

Hence option C is correct.
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Sandy
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Intern
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Joined: 08 Dec 2017
Posts: 39
Followers: 1

Kudos [?]: 37 [0], given: 69

Re: y = |y| and y = -|y| [#permalink] New post 22 Dec 2017, 05:54
If we think y could be a positive number and y could be a negative number then the answer should be D. Sandy can you explain it, please?
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Director
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Joined: 20 Apr 2016
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Re: y = |y| and y = -|y| [#permalink] New post 22 Dec 2017, 06:36
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YMAkib wrote:
If we think y could be a positive number and y could be a negative number then the answer should be D. Sandy can you explain it, please?


From the two statement of y that has to satisfy for all values of y.

y cannot be positive and negative at the same time. The only option for y to satisfy the above equation is when y=0
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Re: y = |y| and y = -|y|   [#permalink] 22 Dec 2017, 06:36
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