From 1 we have
x-y=6
if we put x=6,y=0 we can answer No.
But if we put
x=3, y=-3 we get Yes.
Hence insuff.
From 2 we get x+y=0
or x=-y
which will always gives us a yes.
Hence IMO ans is B.
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Source: Beat The GMAT — Data Sufficiency |