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If xy ≠ 0, could y be expressed as -2/x?

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Rahul
 Post subject: If xy ≠ 0, could y be expressed as -2/x?
 Post Posted: Sat Jun 21, 2008 1:47 pm 
Source: Manhattan Quest for 750: Advanced Quant Homework Bank
If xy ≠ 0, could y be expressed as -2/x?

(1) x2y2 – xy = 6

(2) y ≠ 3/x


I understand for the above DS question answer is A. For A we get ans as y=3/x or y =-2/x. Is it because the question states could be expressed as -2/x?

What is question had stated is y=-2/x? In this case would the answer be "C"
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rfernandez
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 Post Posted: Fri Jun 27, 2008 5:02 am 
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Posts: 386
I agree with that. The relation x^2y^2 - xy = 6 is a non-function whereas y = -2/x is a function, so the two are not simply interchangeable. The wording of the question ("could") is an important distinction.
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Guest
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 Post Posted: Fri Jun 27, 2008 8:29 pm 
Thanks Rey!
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StaceyKoprince
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 Post Posted: Wed Sep 03, 2008 7:04 pm 
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