What is x? DS Problem

[ArpitS975]

Question: What is x?

Statement 1: x=4y-4
Statement 2: xy = 8

Problem is from 5th Edition Algebra Manhattan GMAT, Page 71, Chapter 5.

The answer in the book is E.

I had originally come up with C as both statements together provide you with a quadratic equation which you can the solve for x.

Why is this? Just need some clarification.

Thanks!

[tim]

What is the quadratic, and how did you use it to solve for x? What did you get for x? I got two different values; see if you can find them both. Remember, when you have a quadratic, you need to be actively looking for two solutions.