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That's right. Thanks. While solving the exam, I thought that if I consider both statements together, then x^2 = x. Then dividing both sides by x, I can get x=1. But yes, when here x can either be 0 or 1 and that changes the answer.
1. y=x+1. multiply both sides by x -> xy=x(x+1). No info on x, insuff. 2. y=x^2+1. multiply both sides by x -> xy=x(x^2+1). No info on x, insuff.
Together, equating both statements -> x+1 = x^2+1 -> x = 0, 1 Substituting gives y = 1,2.
Two solutions for xy -> E.
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DS - If negative answer only, still sufficient. No need to find exact solution. PS - Always look at the answers first CR - Read the question stem first, hunt for conclusion SC - Meaning first, Grammar second RC - Mentally connect paragraphs as you proceed. Short = 2min, Long = 3-4 min
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
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