1. Special Functions
Constant
Step
Absolute Value
Piece Wise
Identity

2. When m = 0, the value of the function is f(x) = b, for every
x-value.
f(x) = b
Horizontal lines
Graph:

3. Consist of line segments or rays
Is not linear
Example:
Greatest Integer Function f(x) = [|x|]

4. The absolute value function can be written as a piecewise function
y = |x| or
- x if x < 0
f(x) =
x if x > 0
Graph:

5. A function that is written with two or more expressions.
Example:

6. The function does not change the input value.
Example:
f(x) = x