# How do you differentiate #7xy- 3 lny= 42# at the point (6,1)?

##### 1 Answer

Jun 5, 2015

We have to solve the given equation by implicit differentiation.

The given equation is

Let us express it in the form of

Differentiation w.r.t. x on both sides, we get:

Now, we have determined the general equation for the 1st derivative for the given function. We just need to put the values of

Substituting,