Question

What is the derivative of `y=-4`?

Answer 1

`y'=0`

Explanation:

The derivative is the measure of the rate of change of a function.

`-4` is a constant—that is, it never changes.

Thus, its derivative is `0`, as is the derivative of any other constant.

For more explanations as to why the derivative of a constant is always `0`, read the answers here.