Try to attack on it.
[ 3 - (-2) ] / [ 3 + (-2) ] = 5 which is > 1
[ 3 - (-5) ] / [ 3 + (-5) ] = -4 which is < 1
x and y both satisfy but we got different result.
Answer: E
x,y
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Source: Beat The GMAT — Problem Solving |
(x-y)/(x+y) >1
equivalent to (x-y)/(x+y) -1 >0
equivalent to (-2y)/(x+y) >0
(1), x>0. We can't determine signs of (-2y) and (x+y)
Hence, Insufficient.
(2), y<0 => (-2y)>0, but we can't decide sign of (x+y)
Insufficient.
(1)&(2) the same situation as (2)
Insufficient.
Answer E
equivalent to (x-y)/(x+y) -1 >0
equivalent to (-2y)/(x+y) >0
(1), x>0. We can't determine signs of (-2y) and (x+y)
Hence, Insufficient.
(2), y<0 => (-2y)>0, but we can't decide sign of (x+y)
Insufficient.
(1)&(2) the same situation as (2)
Insufficient.
Answer E
