# What is the slope of the tangent line of # (xy-1/(yx))(xy-1/(xy)) C #, where C is an arbitrary constant, at #(-2,1)#?

##### 1 Answer

Jun 21, 2016

#### Explanation:

**do you mean**

**if so** , i'd use the Implicit Function Theorem

using the product rule for the partials we get

so,