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Does xy=x^2

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by sandeep_chhabra » Thu May 15, 2008 9:52 am
Does xy=x^2 ??


1) xy=y^2
2) x^2 = y^2

shouldnt A be the answer. xy=y^2 is possible only when x=y and if x=y then xy=x^2.

am i missing something?
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Source: — Data Sufficiency |
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by netigen » Thu May 15, 2008 12:03 pm
I think the Q should be is X=Y? Are you sure you got the Q correct.
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by sandeep_chhabra » Thu May 15, 2008 8:42 pm
Yep the question is accurate ...
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Re: Does xy=x^2

by simplyjat » Thu May 15, 2008 9:56 pm
sandeep_chhabra wrote:Does xy=x^2 ??


1) xy=y^2
2) x^2 = y^2

shouldnt A be the answer. xy=y^2 is possible only when x=y and if x=y then xy=x^2.

am i missing something?
xy = y^2 is also possible when y = 0 and x can take any value...
simplyjat
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by netigen » Thu May 15, 2008 10:00 pm
The questions is asking is xy=x^2

or x^2-xy =0

which means either x=0 or x=y?

from (a)
xy=y^2
xy-y^2=0

so y=0 or x=y Insufficient

from (b)
x^2=y^2

so + or -(x)=+or - (y) Insufficient

both (a) and (b) are together sufficient to answer the question because only when x=y the two equations will be true
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by sandeep_chhabra » Thu May 15, 2008 10:00 pm
Right... :)
thanks
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