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sarahw_gmat
- Junior | Next Rank: 30 Posts
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- Joined: Fri Mar 12, 2010 1:39 pm
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is |x|=y-z
if x>=0.then x=y-z,
if x<0, then x=-(y-z)=z-y
(1) x=z-y, but says nothing about x i mean +ve or -ve. insuff
(2)x<0 but no info about y-z
together
x<0 and x=z-y. so |x|=y-z suff
