Posted by **Elisabeth** on Wednesday, February 24, 2010 at 3:06pm.

I saw this question asked, but I didn't understand the answer format. My prof doesn't use dx and dy after he has differentated the problem. He just uses (for example) 8x+2+y+xy(prime)

The question is this:

4x^2+2x+xy=12 and y(2)=-4 find y(prime)(2) by implicit differentiation.