This section has the following **videos**:

- Lesson Video
- Example Set A Practice Problems (Video Solutions)
- Example Set B Practice Problems (Video Solutions)
- Example Set C Practice Problems (Video Solutions)

Linear functions, non-linear functions..who cares! Well if you like good grades in algebra then you want to take “care” on understanding the differences between various functions. Linear functions are lines and non-linear functions are other shapes like parabolas. As long as you have a basic idea of the different type of functions you will be in good shape.

Key concepts to remember:

* lines are “linear functions”

* all other non-line graphs are “non-linear” functions