1. 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
VERTICAL LINE TEST

2. To graph each function by creating a table of values of first:
Step 1: Choose values for x Step 2: Evaluate the function at Step 3: Plot the points on a
(it is best to choose two these values and complete coordinate plane and
negative values, zero, the input-output table graph the function.
and two positive values).
x y = 2x x y = - x -2 -1 1 2
x y = x x

3. Make an Input-Output Table from the given graph:
Step 1: Find where the graph Step 2: Create an Input-Output Step 3: Find the pattern in the
crosses at lattice points Table from those ordered pairs table to create a function rule.
Draw those dots in larger.
x y 3. -2 -1 1 2