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OG 11th Edition (Q64 Inequalities) - Explain pls

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Manager
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OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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New post 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!!

Kudos [?]: 225 [0], given: 2

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Joined: 30 Oct 2008
Posts: 30

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

Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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New post 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

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Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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New post 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

Kudos [?]: 13 [0], given: 0

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Joined: 04 Dec 2008
Posts: 104

Kudos [?]: 225 [0], given: 2

Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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New post 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

Kudos [?]: 225 [0], given: 2

Intern
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Joined: 29 Dec 2006
Posts: 32

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Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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New post 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

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Re: OG 11th Edition (Q64 Inequalities) - Explain pls [#permalink]

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New post 16 Apr 2009, 05:52
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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?

Kudos [?]: 149 [2], given: 10

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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