1. 4.7 – writing functions Textbook pg. 262 Objective:
The student will write equations that represent functions in order to write a function rule.

2. Dependent variable (y) depends on the independent variable (x)
Identify the dependent & independent:
More electricity is used when the temperature goes up
The cost of shipping a package is based on the weight

3. Writing Functions: Identify independent and dependent
Choose variables for function notation
Write equation from scenario
3) A lawyer’s fee is $200 per hour
4) The admission fee to a carnival is $8 and each ride costs $1.50

4. 5) You can estimate the outside temperature (t) by counting the number of chirps (c) from a cricket. The temperature is 40 degrees more than one-fourth of the number of chirps. 6) A landfill has 50,000 tons of waste and accumulates 420 more tons every month. Write a function rule. How much waste will be in the landfill after 4 months? How many months will it take for their to be tons?

5. Name Date Period 4.7 – pg. 265 #9-16