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

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Director
Director
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Joined: 29 Aug 2005
Posts: 855

Kudos [?]: 472 [0], given: 7

Is 5|x| = y 2z? 1. 5x + y = 2z 2. x < 0 [#permalink]

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New post 07 Jun 2009, 01:35
00:00
A
B
C
D
E

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Is 5|x| = y – 2z?

1. 5x + y = 2z
2. x < 0

Kudos [?]: 472 [0], given: 7

Director
Director
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Joined: 23 May 2008
Posts: 803

Kudos [?]: 82 [0], given: 0

Re: DS [#permalink]

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New post 07 Jun 2009, 12:45
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

Kudos [?]: 82 [0], given: 0

Senior Manager
Senior Manager
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Joined: 15 Jan 2008
Posts: 281

Kudos [?]: 47 [0], given: 3

Re: DS [#permalink]

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New post 08 Jun 2009, 01:53
agree C shud be the answer ,, IMO..

Kudos [?]: 47 [0], given: 3

SVP
SVP
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Joined: 28 Dec 2005
Posts: 1549

Kudos [?]: 173 [0], given: 2

Re: DS [#permalink]

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New post 08 Jun 2009, 04:58
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 ?

Kudos [?]: 173 [0], given: 2

Director
Director
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Joined: 23 May 2008
Posts: 803

Kudos [?]: 82 [0], given: 0

Re: DS [#permalink]

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New post 08 Jun 2009, 10:43
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?

Kudos [?]: 82 [0], given: 0

Manager
Manager
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Joined: 11 Aug 2008
Posts: 151

Kudos [?]: 53 [0], given: 8

Re: DS [#permalink]

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New post 08 Jun 2009, 17:59
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

Kudos [?]: 53 [0], given: 8

Re: DS   [#permalink] 08 Jun 2009, 17:59
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Is 5|x| = y 2z? 1. 5x + y = 2z 2. x < 0

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