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# OG 11th Edition (Q64 Inequalities) - Explain pls

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Manager
Joined: 04 Dec 2008
Posts: 101
OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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31 Mar 2009, 21:58
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Is x>y?

(1) x=y+2

(2)x/y=y-1

Appreciate if someone could explain why stmt 2 not sufficient. The book explanation not clear. Thanks!!
Intern
Joined: 30 Oct 2008
Posts: 30
Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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31 Mar 2009, 22:07
y is not equal to zero since x/y is in expression.

say if y=0.5 x=-0.25
if y=-0.5 x=0.75
Manager
Joined: 19 Aug 2006
Posts: 233
Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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31 Mar 2009, 22:57
joyseychow wrote:
Is x>y?

(1) x=y+2

(2)x/y=y-1

Appreciate if someone could explain why stmt 2 not sufficient. The book explanation not clear. Thanks!!

x = y^2-y
x can be >y: 12=4^2-4
x can be <y: -0.25=0.5^2-0.5
Manager
Joined: 04 Dec 2008
Posts: 101
Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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31 Mar 2009, 23:23
joyseychow wrote:
Is x>y?

(1) x=y+2

(2)x/y=y-1

Appreciate if someone could explain why stmt 2 not sufficient. The book explanation not clear. Thanks!!

Sorry! I made a typo error on stmt 2. The question should be:

Is x>y?

(1) x=y+2

(2) x/2=y-1

OA: A
Intern
Joined: 29 Dec 2006
Posts: 31
Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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15 Apr 2009, 23:08
joyseychow wrote:
joyseychow wrote:
Is x>y?

(1) x=y+2

(2)x/y=y-1

Appreciate if someone could explain why stmt 2 not sufficient. The book explanation not clear. Thanks!!

Sorry! I made a typo error on stmt 2. The question should be:

Is x>y?

(1) x=y+2

(2) x/2=y-1

OA: A

when y=2, x = 2
when y = 10, x = 8
Manager
Joined: 22 Feb 2009
Posts: 135
Schools: Kellogg (R1 Dinged),Cornell (R2), Emory(Interview Scheduled), IESE (R1 Interviewed), ISB (Interviewed), LBS (R2), Vanderbilt (R3 Interviewed)
Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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16 Apr 2009, 05:52
2
KUDOS
x=2y-2
=> x-y=3y-2

We are asked whether x-y>0?

But from st 2 we cannot say whether x-y>0 , as it depends on the value of y which is not specified. I think there is no need to consider numbers here to prove the point. Am I correct?
Re: OG 11th Edition (Q64 Inequalities) - Explain pls   [#permalink] 16 Apr 2009, 05:52
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# OG 11th Edition (Q64 Inequalities) - Explain pls

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