If x ≠ 1 and if yx/(y - x) = 1, what is the value of y in terms of x? Choose the correct answer:
A) (1-x)/x B) (x - 1)/x C) x/(x + 1) D) (x + 1)/x E) x/(1-x)
This question comes with a particular 'quirk' (one that you probably won't see on Test Day). The GMAT won't test you on the concept of undefined numbers (re: numbers divided by 0), so any time that this concept is a possibility, the question writers have to add a restriction that removes the option that a 0 could occur in the denominator.   Here, we're told that B CANNOT = 1, which is a bit strange because that restriction doesn't seem to impact the original equation much. In fact, it impacts JUST ONE of the answer choices - so you have to ask WHY that restriction is even there. It's actually because that one answer is the correct one.   Final Answer:   x/(1-x)
<result>E</result>
If x ≠ 1 and if yx/(y - x) = 1, what is the value of y in terms of x?