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If x > y, is zx > yx?

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Intern
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Joined: 23 Jul 2012
Posts: 5
Concentration: Finance, Strategy
GMAT 1: 560 Q37 V28
GMAT 2: Q0 V0
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WE: Accounting (Accounting)
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Kudos [?]: 6 [0], given: 4

If x > y, is zx > yx? [#permalink] New post 30 Jul 2012, 18:13
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E

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Question Stats:

60% (02:20) correct 40% (01:05) wrong based on 67 sessions
If x > y, is zx > yx?

(1) z > 0

(2) y < 0
[Reveal] Spoiler: OA
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Re: If x > y, is zx > yx? [#permalink] New post 31 Jul 2012, 00:13
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If x > y, is zx > yx?

Is zx > yx? --> is zx-yx>0? --> is x(z-y) >0?

(1) z > 0. Clearly insufficient.

(2) y < 0. Clearly insufficient.

(1)+(2) Now, remember that we can subtract inequalities with the signs in opposite direction --> subtract (2) from (1): z-y>0. So, we know that the second multiply in x(z-y) is positive, but we still don't know the sign of x: from the stem (x>y) and the second statement (y<0) the only thing we can deduce is that x is greater than negative number y, hence x could be negative, positive or zero. Not sufficient.

Answer: E.

Hope it's clear.
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Re: If x > y, is zx > yx? [#permalink] New post 31 Jul 2012, 01:03
Its E.. bt i got c ..then i realized we must knw what wud be the value of x ..and value of x is not given ...so its E..
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Re: If x > y, is zx > yx? [#permalink] New post 12 Dec 2013, 02:10
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If x > y, is zx > yx? [#permalink] New post 23 Dec 2013, 18:57
Does anyone have advice on how to tackle these problems faster? I always end up resorting to plugging in numbers and various conditions and even though that helps me ensure more accuracy, it usually takes me about 3 min. per such problem (inequalities with only variables).
Re: If x > y, is zx > yx?   [#permalink] 23 Dec 2013, 18:57
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