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GMATprep- absolute value

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Intern
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GMATprep- absolute value [#permalink]

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New post 17 Aug 2008, 08:25
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Seems like I always get absolute value q's wrong. Ahhh...
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Re: GMATprep- absolute value [#permalink]

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New post 17 Aug 2008, 09:01
flygmat wrote:
Seems like I always get absolute value q's wrong. Ahhh...


D

(1) Sufficient

If zy < xy < 0 and z < x, then y > 0 and z and x are both negative

Thus,
|x - z| + |x| = |z| - |x| + |x| = |z|

OR

|x - z| + |x| = -(z-x) + (-x) = -z + x - x = -z
Because z is negative, |z| = -z.

(2) Sufficient

If y > 0, then z and x are both negative.

Same solution as (1)

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Re: GMATprep- absolute value [#permalink]

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New post 19 Aug 2008, 18:19
zoinnk wrote:
flygmat wrote:
Seems like I always get absolute value q's wrong. Ahhh...


D

(1) Sufficient

If zy < xy < 0 and z < x, then y > 0 and z and x are both negative

Thus,
|x - z| + |x| = |z| - |x| + |x| = |z|

OR

|x - z| + |x| = -(z-x) + (-x) = -z + x - x = -z
Because z is negative, |z| = -z.


(2) Sufficient

If y > 0, then z and x are both negative.

Same solution as (1)


Finally got it!!!!
Since y= + and z and x = -, both are sufficient.
I plugged in numbers to figure it out. Thanks!

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Re: GMATprep- absolute value   [#permalink] 19 Aug 2008, 18:19
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GMATprep- absolute value

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