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# m04 #24

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Intern
Joined: 22 Sep 2008
Posts: 11
Followers: 0

Kudos [?]: 1 [0], given: 0

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

1. xy=x

2. x+y=y

Please explain why statement 1 is insufficient.
_________________

It's not the IMO, it's the OA!!

Director
Joined: 12 Jul 2008
Posts: 518
Schools: Wharton
Followers: 16

Kudos [?]: 122 [0], given: 0

Re: m04 #24 [#permalink]  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.
SVP
Joined: 05 Jul 2006
Posts: 1516
Followers: 5

Kudos [?]: 124 [0], given: 39

Re: m04 #24 [#permalink]  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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