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If xy+k=k

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RUMNI
 Post subject: If xy+k=k
 Post Posted: Wed Dec 24, 2008 9:47 am 
If xy+k=k and x cannot equal 0, which of the following must be true?

(A) x>y

(B) x+y=0

(C) y=0

(D) |x-y|=0

(E) xy=1
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Khalid
 Post subject: Re: If xy+k=k
 Post Posted: Wed Dec 24, 2008 4:35 pm 
RUMNI wrote:
If xy+k=k and x cannot equal 0, which of the following must be true?

(A) x>y

(B) x+y=0

(C) y=0

(D) |x-y|=0

(E) xy=1



Is the answer C,

xy + k = k
xy = 0

But x cant equal 0, thus y = 0
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rumni
 Post subject:
 Post Posted: Wed Dec 24, 2008 5:57 pm 
Khalid...I think the answer is indeed C. This was an easy problem. Should have gotten it. Your explaination makes me see that.
Thanks.
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RonPurewal
 Post subject: Re: If xy+k=k
 Post Posted: Sun Dec 28, 2008 9:11 am 
Offline
ManhattanGMAT Staff


Posts: 7146
Khalid wrote:

Is the answer C,

xy + k = k
xy = 0

But x cant equal 0, thus y = 0


you got it.
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