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Is 5|x| = y 2z? 1. 5x + y = 2z 2. x < 0

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Director
Joined: 29 Aug 2005
Posts: 854
Is 5|x| = y 2z? 1. 5x + y = 2z 2. x < 0 [#permalink]

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07 Jun 2009, 00:35
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Is 5|x| = y – 2z?

1. 5x + y = 2z
2. x < 0
Director
Joined: 23 May 2008
Posts: 799

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07 Jun 2009, 11:45
I think C

-5lxl + y = 2z?

1) 5x + y = 2z
If x is neg yes if x is Pos no

2) x<0
No info on y or z

Together
x is neg so 5(x) = -5lxl
suff
Senior Manager
Joined: 15 Jan 2008
Posts: 275

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08 Jun 2009, 00:53
agree C shud be the answer ,, IMO..
SVP
Joined: 28 Dec 2005
Posts: 1542

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08 Jun 2009, 03:58
here's my question: from the stem, you know that there are two potential solutions, depending on whether x is positive or negative.

Statement 1 gives you one of those solutions, from which you can infer that x is negative. So wouldnt the answer just be A ?
Director
Joined: 23 May 2008
Posts: 799

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08 Jun 2009, 09:43
pmenon wrote:
here's my question: from the stem, you know that there are two potential solutions, depending on whether x is positive or negative.

Statement 1 gives you one of those solutions, from which you can infer that x is negative. So wouldnt the answer just be A ?

how can you infer that x is negative?
Manager
Joined: 11 Aug 2008
Posts: 150

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08 Jun 2009, 16:59
pmenon wrote:
here's my question: from the stem, you know that there are two potential solutions, depending on whether x is positive or negative.

Statement 1 gives you one of those solutions, from which you can infer that x is negative. So wouldnt the answer just be A ?

From 1/ 5x=2z-y
With x>0 =>5lxl = 2z - y
With x<0 => 5lxl = y - 2z
not suf
2/ x<0, no info about y & z (insuf)
together we have 5lxl = y - 2z YES
Hence C
Re: DS   [#permalink] 08 Jun 2009, 16:59
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