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If xy >=0, what is the value of 1/x + 1/y ?

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If xy >=0, what is the value of 1/x + 1/y ? [#permalink] New post 14 Oct 2006, 10:12
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82% (02:17) correct 18% (02:55) wrong based on 19 sessions
If xy >=0, what is the value of 1/x + 1/y ?

(1) 1/(x + y) = -1
(2) xy = 6(x + y)
[Reveal] Spoiler: OA
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Re: If xy >=0, what is the value of 1/x + 1/y ? [#permalink] New post 14 Oct 2006, 10:44
if xy >=0, what is the value of 1/x + 1/y?

1) 1/(x+y) = -1
2) xy = 6(x+y)

1/x+1/y = y+x / yx

from one x+y = -1......insuff

from two

xy = 6(x+y)

x+y / xy = 1/6......suff

My answer is B
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Re: If xy >=0, what is the value of 1/x + 1/y ? [#permalink] New post 20 Oct 2014, 09:41
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Re: If xy >=0, what is the value of 1/x + 1/y ?   [#permalink] 20 Oct 2014, 09:41
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