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m04 #24

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m04 #24 [#permalink] New post 09 Oct 2008, 17:18
Is x=0?

1. xy=x

2. x+y=y

Please explain why statement 1 is insufficient.
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Re: m04 #24 [#permalink] New post 09 Oct 2008, 18:48
gmat4life wrote:
Is x=0?

1. xy=x

2. x+y=y

Please explain why statement 1 is insufficient.


when y = 1, x can be any number.
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Re: m04 #24 [#permalink] New post 10 Oct 2008, 03:52
gmat4life wrote:
Is x=0?

1. xy=x

2. x+y=y

Please explain why statement 1 is insufficient.


from 1

x(y-1) = 0

thus either x = 0 or y =1........insuff

from 2

x = y-y = 0.......suff

B
Re: m04 #24   [#permalink] 10 Oct 2008, 03:52
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m04 #24

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