# Deriving using chain rule

1. Nov 11, 2008

### lemonlee

1. The problem statement, all variables and given/known data
2x^2+5xy-y^2=1

2. Relevant equations
d/dx(f(u)x))=df/du * du/dx

3. The attempt at a solution

i got (2y-4x)/5x but i'm almost certain that its wrong......can anyone help me?

2. Nov 11, 2008

### gabbagabbahey

Assuming that you are trying to find $$\frac{dy}{dx}$$ (you didn't actually tell us what you are trying to calculate!), then it is wrong....However, I can't tell you what you did wrong since you haven't shown me what you did to get your answer....if you do that, I'll be able to help you