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Source: — Data Sufficiency |
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by clock60 » Tue Jul 19, 2011 12:19 pm
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
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by sarahw_gmat » Tue Jul 19, 2011 1:59 pm
From the first statement I deduced x is positive. Why is it wrong?
clock60 wrote: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
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