Question

Is it necessary to perform the horizontal line test when finding the inverse of every function? Why or why not?

Answer 1

The function has an inverse if it is a one-to-one function

We use the horizontal line test to check if the function is a one-to-one function or not

Then it is necessary to use the horizontal line test because if the function is not a one-to-one function there is no inverse to it

The answer is

Yes it is necessary