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GMAT Prep Question help needed : Tomo is my exam
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kevincanspain
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Is |x| = y - z ?
(1) x + y = z
This tells us that y - z = - x
We know that |x| = x if x > 0 and |x| = - x if x < 0
Thus |x| = y - z if and only if x is less than or equal to 0
However, we don't know the sign of x. NOT SUFF
(2) NOT SUFF
(T) SUFF
(1) x + y = z
This tells us that y - z = - x
We know that |x| = x if x > 0 and |x| = - x if x < 0
Thus |x| = y - z if and only if x is less than or equal to 0
However, we don't know the sign of x. NOT SUFF
(2) NOT SUFF
(T) SUFF
Kevin Armstrong
GMAT Instructor
Gmatclasses
Madrid
GMAT Instructor
Gmatclasses
Madrid
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Frankenstein
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Hi,
From(1): x=z-y. So, |x| = |z-y| = z-y, if x>=0 and y-z if x<=0
Insufficient
From(2): x<0, we know nothing about the relation between x,y,z
Insufficient
Combining (1) & (2)
|x| = y-z
Sufficient
Hence, C
From(1): x=z-y. So, |x| = |z-y| = z-y, if x>=0 and y-z if x<=0
Insufficient
From(2): x<0, we know nothing about the relation between x,y,z
Insufficient
Combining (1) & (2)
|x| = y-z
Sufficient
Hence, C
Last edited by Frankenstein on Wed Jun 01, 2011 4:09 am, edited 1 time in total.
Cheers!
Things are not what they appear to be... nor are they otherwise
Things are not what they appear to be... nor are they otherwise
