## Functions 9 - one-to-one Functions

Functions 9 - one-to-one Functions
• Currently 4.0/5 Stars.
7129 views, 2 ratings - 00:10:08
Part of video series Relations and Functions
Taught by YourMathGal

### Meets NCTM Standards:

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
• What is the definition of a one-to-one function?
• How can you determine if a function is 1-1?
• What does a one-to-one function look like?
• What is the horizontal line test for determining if a function is one-to-one?
• What are some examples of real-world 1-1 functions?
• What has to be true for a set of ordered pairs to be a 1-1 function?
• Is a society with polygamy, is marriage a 1-1 function?
• Is the set {(2, -1), (3, 4), (0, 5), (-1, 3)} a 1-1 function?
• Is the set {(4, 3), (3, 4), (-1, 3)} a 1-1 function?
• Is the set {(Tom, Lisa), (Sue, Mary), (Jen, Lisa), (Ed, Cindy)} a 1-1 function?
• How can you use a visual picture to help determine if a function is 1-1?
This is a very good tutorial explaining what one-to-one functions are, what they look like and behave like, and how to determine if a function is one-to-one. All ideas and concepts of one-to-one functions are explained in this lesson.
• Currently 4.0/5 Stars.
Reviewed by MathVids Staff on July 11, 2010.