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

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if xy >=0, what is the value of 1/x + 1/y? 1) 1/(x+y) = [#permalink] New post 14 Oct 2006, 10:12
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if xy >=0, what is the value of 1/x + 1/y?

1) 1/(x+y) = -1
2) xy = 6(x+y)
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Joined: 05 Jul 2006
Posts: 1542
Followers: 5

Kudos [?]: 65 [0], given: 39

 [#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
  [#permalink] 14 Oct 2006, 10:44
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if xy >=0, what is the value of 1/x + 1/y? 1) 1/(x+y) =

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