1. VOCABULARY! EXAMPLES!
Relation:
Domain:
Range:
Function:
A set of ordered pairs
The set of all the input (x) values
The set of all the output (y) values
A special relation that has exactly ONE output for each input (or exactly ONE y value for each x value)
A function rule is:
Function notation:
To Evaluate a Function Rule:
An equation that describes a function
Use f(x) to indicate the output of a function
Plug in the input value(s) for x . . .
Simplify to find the output values (order of operations!)

2. VERTICAL LINE TEST GRAPHS can represent functions.
The ____________________ ___________ __________ can help you test whether or not a graph is a function.
Remember: There can only be ONE y value for each x value. If you run your pencil across two points vertically above one another, it is NOT a function!
Determine
which
graphs
are
functions
Can the graph of a function be a horizontal line? A vertical line? Explain why or why not.
VERTICAL LINE TEST

3. On #1-3 Tell whether each relation is a function. If so …
Find domain and range from a table, mapping or graph.
Find the range of a function rule given a specific domain.
On # Tell whether each relation is a function. If so … x y