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RUMNI
 
 

If xy+k=k

by RUMNI 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
Khalid
 
 

Re: If xy+k=k

by Khalid 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
rumni
 
 

by rumni 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.
RonPurewal
Students
 
Posts: 19744
Joined: Tue Aug 14, 2007 8:23 am
 

Re: If xy+k=k

by RonPurewal Sun Dec 28, 2008 9:11 am

Khalid Wrote:
Is the answer C,

xy + k = k
xy = 0

But x cant equal 0, thus y = 0


you got it.