|X| = 1-Y means..
1) if X is +ve => x=1-Y => X+Y=1
2) if X is -ve then X=Y-1 => X-Y=-1
A) X+Y=1, true for +ve X, false for -ve. NOT SUFF
B) X<0 , nit enough info, NOT SUFF
c) X<0 and X+Y=1 => niether 1) nor 2) is true. given statement is not true.
Ans : C
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Source: Beat The GMAT — Data Sufficiency |
let me try:
if x<0 and x+y=1 then only thing we know is what?
if x=-1, y=2 so y+1 = 3 and |x| != y+1
x=-.5, y=1.5 so again |x| != y+1
and it will never be..
y = -1.5, x = -0.5
if x<0 and x+y=1 then only thing we know is what?
if x=-1, y=2 so y+1 = 3 and |x| != y+1
x=-.5, y=1.5 so again |x| != y+1
and it will never be..
y = -1.5, x = -0.5
