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GMAT Data Sufficiency (DS) | Re: If k is a positive constant and y = |x - k| - |x + k|, what

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Pretty straightforward

Since we want the maximum value of 'y' and knowing that |x - k| is always >=0, we wan't |x + k| = 0, thus x= -k in order to have min 'y'

Statement 1 only says that x<0 but still not information on the exact value
Statement 2 gives that k=3, therefore x=-3 and we can solve min 'y' having the value of both variables

Therefore answer is B

Hope this clarifies
Cheers!
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