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# What is the value of xy? (1) y = x+1 (2) y=x^2 +1

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Manager
Joined: 28 Dec 2007
Posts: 132
Schools: Stanford R1, Wharton R1 w/int, Chicago R1, HBS R2
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What is the value of xy? (1) y = x+1 (2) y=x^2 +1 [#permalink]  19 Feb 2008, 13:23
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What is the value of xy?

(1) y = x+1

(2) y=x^2 +1

Manager
Joined: 29 Jul 2007
Posts: 182
Followers: 1

Kudos [?]: 16 [0], given: 0

Re: DS - Value of XY? [#permalink]  19 Feb 2008, 13:36
E.

I. Can be any number of combinations
II. Can also be any number of combinations.

together:
x^2+1 = x +1

x^2 - x = 0
x( x - 1) = 0
x= 0 or x = 1
Manager
Joined: 28 Dec 2007
Posts: 132
Schools: Stanford R1, Wharton R1 w/int, Chicago R1, HBS R2
Followers: 3

Kudos [?]: 32 [0], given: 1

Re: DS - Value of XY? [#permalink]  19 Feb 2008, 13:47
right. that makes sense. OA is E. Thanks!
SVP
Joined: 28 Dec 2005
Posts: 1579
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Kudos [?]: 91 [0], given: 2

Re: DS - Value of XY? [#permalink]  19 Feb 2008, 17:23
should be E.

stat 1 and 2 by themselves are insuff. Together, you just have x^2-x=0 --> x(x-1)=0 ... two possible values for x, so even together the statements are insufficient.
Re: DS - Value of XY?   [#permalink] 19 Feb 2008, 17:23
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