# How do you implicitly differentiate #7xy- 3 lny= 42#?

##### 1 Answer

Feb 18, 2017

#### Explanation:

Ignore the

Now take a look at -3lny. Since 3 is a constant in front, you only need to worry about the derivaitve of lny and then multiply the 3 later.

The derivative of a constant is always 0 so the equation will be equal to 0. Now combine your two parts together.

Subtract 7y on both sides.

Then factor out

Isolate