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Source: — Data Sufficiency |
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by 4meonly » Tue Sep 30, 2008 10:09 am
|x| = y-z?

(1)
x+y=z

if x>0, then x+y=z, or x=z-y, so |x| ≠ y-z
if x<0, then -x+y=z, or x=y-z, so |x| = y-z
INSUFF

(2)
x<0
noyhing about z and y
INSUFF

(1)(2)
x<0, then -x+y=z, or x=y-z, so |x| = y-z
SUFF

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