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bmwhype2
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GMATprep - Numbers 21 Feb 2008, 10:37
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kidderek
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GMATprep - Numbers 21 Feb 2008, 11:22
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bmwhype2
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Reduced to Z=XZ

B-c has y in it, and y really plays no factor in it.

I like E
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srp
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GMATprep - Numbers 21 Feb 2008, 11:30
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I am sure bmwhype2 is going to say - nah the answer selected is not the answer. :?
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bmwhype2
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GMATprep - Numbers 21 Feb 2008, 11:37
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I am sure bmwhype2 is going to say - nah the answer selected is not the answer. :?
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actually i selected that answer, but not 100% sure. wanted to see what others thought before i go and check the OA yet.
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jimmyjamesdonkey
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GMATprep - Numbers 21 Feb 2008, 12:02
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Its E i think. I factored.

xy + z = xy + xz

0 = xz - z
0 = z(x-1)

z = 0 and x -1 = 0

z= 0 x = 1
E.

But can anyone explain why plugging in won't work for this problem. If you plug in A will work.
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GMATBLACKBELT
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GMATprep - Numbers 21 Feb 2008, 19:19
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xy+z=xy+xz --> 0=xz-z --> 0=z(x-1) thus z=0 and x=1
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bmwhype2
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GMATprep - Numbers 21 Feb 2008, 22:04
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kidderek
bmwhype2
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Reduced to Z=XZ

B-c has y in it, and y really plays no factor in it.

I like E
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i also reduced it to z=xz
i didnt set it to xz-z=0
i think thats where we both screwed up but chose the correct answer
need to isolate like variables before finding the values

possible answers for z=xz
1=1*1
0 = 0*0
anything = 1*anything

this is why i was a little confused and posted this q



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This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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