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If xy+z=x(y+z)

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agha79
 Post subject: If xy+z=x(y+z)
 Post Posted: Sat Feb 19, 2011 10:52 am 
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Course Students


Posts: 98
If xy+z=x(y+z), which of the following must be true?

A. x=0 and z=0
B. x=1 and y=1
C. y=1 and z=0
D. x=1 or y=0
E. x=1 or z=0

OA is E. I figured more then one answer choices can hold the equality e.g B. Can anyone please help!

Thanks!
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jnelson0612
 Post subject: Re: If xy+z=x(y+z)
 Post Posted: Sat Feb 19, 2011 10:46 pm 
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ManhattanGMAT Staff


Posts: 1857
Please see this thread: if-xy-z-x-y-z-which-of-the-following-must-be-true-t10841.html

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Jamie Nelson
ManhattanGMAT Instructor
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