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Hi GMATPrep Question need help

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Junior | Next Rank: 30 Posts
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Hi GMATPrep Question need help

by sangeethmani » Tue Dec 15, 2009 1:10 pm
If xy+z=x(y+z),which of the following must be true?
1) x=0 and z=0
2)x=1 and y=1
3)y=1 and z=0
4)x=1 or y=0
5)x=1 or z=0
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Master | Next Rank: 500 Posts
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by Giorgio » Tue Dec 15, 2009 1:26 pm
xy+z=xy+xz
Z=XZ
Z(1-x)=0

so either z =0 or x =1
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