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What is the value of y? (1) 3|x^2 4| = y 2 (2) |3 y| = 11

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What is the value of y? (1) 3|x^2 4| = y 2 (2) |3 y| = 11 [#permalink] New post 11 Dec 2008, 14:33
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Senior Manager
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Re: DS: Y? [#permalink] New post 11 Dec 2008, 16:37
C
stmt1 : what is x ? - In Suff
stmt2: y could be -8 or 14 - In Suff

Together

3|x^2 - 4| can't be negative, so y = 14 - Suff
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Re: DS: Y? [#permalink] New post 11 Dec 2008, 20:37
even i got this one wrong on mgmat..

and its soo simple..

hey what do you think about mgmat math cat ? do you think they are representitive of the real gmat?
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Re: DS: Y? [#permalink] New post 11 Dec 2008, 22:54
Can it be A

3|x^2 – 4| = y – 2 can be written as

3(x^2 – 4) = y – 2 ---------(1)
3(x^2 – 4) = -y + 2 --------(2)

from 1 and 2,

y == 2.

Stm2: y could be -8 or 14 - In Suff

please advice if i am wrong
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Re: DS: Y? [#permalink] New post 12 Dec 2008, 14:25
fresinha12 wrote:
even i got this one wrong on mgmat..

and its soo simple..

hey what do you think about mgmat math cat ? do you think they are representitive of the real gmat?


I havn't given all the MGMAT tests yet. I am planning to do that next week.
Has anyone got any insight into this ? I am curious to know too...
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Re: DS: Y? [#permalink] New post 12 Dec 2008, 22:20
selvae wrote:
Can it be A

3|x^2 – 4| = y – 2 can be written as

3(x^2 – 4) = y – 2 ---------(1)
3(x^2 – 4) = -y + 2 --------(2)

from 1 and 2,

y == 2.

Stm2: y could be -8 or 14 - In Suff

please advice if i am wrong



Here equating the two equations will not help as these two equations are for two different conditions.

If you look at stmt1, left side is >=0. Hence, for the right side to be >=0, y >=2 and there is no single value of y. Hence, stmt1 is insufficient.
Re: DS: Y?   [#permalink] 12 Dec 2008, 22:20
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What is the value of y? (1) 3|x^2 4| = y 2 (2) |3 y| = 11

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