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If x ≠ −1 and y ≠ ±1, then what is the value of

If x ≠ −1 and y ≠ ±1, then what is the value of image?

(1) x = 5

(2) y = 4


(A) if statement (1) ALONE is sufficient to answer the question but statement (2) alone is not sufficient;
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Data Sufficiency Free Lesson Set

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Posted: 03/26/2012 19:05
Why can't I simply plug in the value of y = 4 and arrive at the final answer? Both statements alone should be sufficient right?
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Posted: 03/26/2012 19:41
AV, if we factor out x in the numerator, we can cancel (y-1) in both numerator / denominator. We can do this because the problem says y ≠ ±1. Otherwise (y-1) could have a value of 0 and we can't cancel. Left with an expression containing only the x variable, we don't need statement (2) to compute the value.
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