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If xy=-6 what is the value of xy(x+y)? 1) x-y=5 2)xy^2=18

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Senior Manager
Senior Manager
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If xy=-6 what is the value of xy(x+y)? 1) x-y=5 2)xy^2=18 [#permalink] New post 11 Jul 2004, 08:48
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A
B
C
D
E

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If xy=-6 what is the value of xy(x+y)?

1) x-y=5
2)xy^2=18

Please explain. This is driving me crazy.
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Senior Manager
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 [#permalink] New post 11 Jul 2004, 10:33
B.

1)
x-y = 5 , xy = -6
x=5+y
(5+y)y = -6

Two solutions: (x,y) = (3,-2) or (2,-3)
Insufficient.

2)
x*y^2 = 18
xy=-6
x*y*y = 18
(-6)*y = 18
y=-3
x=2
Sufficient.
Director
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 [#permalink] New post 12 Jul 2004, 06:26
(B)

1 will give 2 results for a & b
2 will give single result for a & b.
Senior Manager
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 [#permalink] New post 12 Jul 2004, 07:40
B is the correct answer. Thanks guys.
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  [#permalink] 12 Jul 2004, 07:40
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If xy=-6 what is the value of xy(x+y)? 1) x-y=5 2)xy^2=18

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