What's the process of determining if a function has an inverse

Johnny_L said:
without doing the vertical line test?

http://www.coolmath.com/algebra/16-inverse-functions/06-one-to-one-01

I was looking here, and this site said that was another way, but they didn't get into it. If all you have is a link to a resource, that's cool too. I tried searching google but couldn't find anything.
Click to expand...

Vertical line test is for determining whether a give expression is a function or not.

It is NOT for determining whether an inverse exist or not.

Please restate your question correctly - also tell us if you are in calculus class or not.
 
Subhotosh Khan said:
Vertical line test is for determining whether a give expression is a function or not.

It is NOT for determining whether an inverse exist or not.

Please restate your question correctly - also tell us if you are in calculus class or not.
Click to expand...

I meant horizontal line test. Mistyped. I'm reviewing to take the College Algebra Clep, and I forgot some stuff. I have a book by Blitzer I'm using as well.

Edit: Got the answer. All functions that have an inverse must be one-to-one.

I used this video help me with determining if a function is one-to-one.

https://www.youtube.com/watch?v=9b8Xd77f-qk
 
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