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joyseychow
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OG 11th Edition (Q64 Inequalities) - Explain pls 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!!



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OG 11th Edition (Q64 Inequalities) - Explain pls 31 Mar 2009, 22:07
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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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OG 11th Edition (Q64 Inequalities) - Explain pls 31 Mar 2009, 22:57
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joyseychow
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!!
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x = y^2-y
x can be >y: 12=4^2-4
x can be <y: -0.25=0.5^2-0.5
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OG 11th Edition (Q64 Inequalities) - Explain pls 31 Mar 2009, 23:23
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joyseychow
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!!
Show more

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

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OG 11th Edition (Q64 Inequalities) - Explain pls 15 Apr 2009, 23:08
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joyseychow
joyseychow
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
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when y=2, x = 2
when y = 10, x = 8
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OG 11th Edition (Q64 Inequalities) - Explain pls 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?



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