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M04 #24

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M04 #24 [#permalink] New post 04 May 2010, 15:16
Is x=0?
1. xy=x
2. x+y=y

Statement (1) by itself is insufficient. implies either x=0 or y=1 .

Statement (2) by itself is sufficient. S2 implies that x=0 .

The correct answer is B.
I see why statement 2 is sufficient, but why statement 1 is not sufficient. Doesn't st.1 tells that x=0, so sufficient?.
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Re: M04 #24 [#permalink] New post 04 May 2010, 15:25
gmat00 wrote:
Is x=0?
1. xy=x
2. x+y=y

Statement (1) by itself is insufficient. implies either x=0 or y=1 .

Statement (2) by itself is sufficient. S2 implies that x=0 .

The correct answer is B.
I see why statement 2 is sufficient, but why statement 1 is not sufficient. Doesn't st.1 tells that x=0, so sufficient?.


x can be any number as long as y = 1
Re: M04 #24   [#permalink] 04 May 2010, 15:25
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M04 #24

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