2. A function is a relationship that
pairs each input value with
exactly one output.
• Function machine:
• One number goes in
• Another unique
number comes out.
-2
y = 3x
-6

3. Domain is the set of all
possible input values
Usually x’s
Range is the set of all possible
output values
Usually y’s

4. Write the ordered pairs.
Identify inputs and outputs.
Example:

5. Find the domain and range:

6. Find the domain and range:

7. Independent variable –
represents the input values
Can be any value in the domain
Dependent variable –
represents the output values
Depends on the value of the
independent variable

8. The # of quarters you put in a
parking meter affects the time
left on the meter.
Identify the independent and
dependent variables.

9. Ex: The function y = -4x + 14
gives the number of avocados left
after making x batches of
guacamole.
Identify the independent and
dependent variables.
The domain is 0, 1, 2, and 3.
What is the range?

10. The function y = -3x + 12 gives
the amount y (in ounces) of juice
remaining after you take x gulps.
Identify the independent and
dependent variables.
The domain is 0, 1, 2, 3 and 4.
What is the range?