Hello,

I need help with the following question (As listed in Guide 2-Page 89- Chapter 6- Question 5 )

What is x?

1) x = 4y-4

2) xy =8

Answer is E. I am having a hard time understanding the answer. I expected it to be C as you can get x as {-8,4} and you have a quadratic equation which is not a perfect square. Please help.