2. Writing a Function Rule Read the problem What are you looking for? Define the variables Pick the letters What do they stand for? Write the equation Solve.

3. Examples 1 and 2 5 less than ¼ of x is y. 1.5 more than the quotient of a and 4 is b.

4. Example 3 The price, p, of a cup of ice cream is $3.95 plus $0.85 for each topping. Jeff is 3 years younger than twice his brothers age. Write a function rule if Jeff’s age, j, is a function of his brother’s age, b. How old is Jeff if his brother is 5?

5. Example 4 Jeff is 3 years younger than twice his brothers age. Write a function rule if Jeff’s age, j, is a function of his brother’s age, b. How old is Jeff if his brother is 5?

6. Example 5 A hot dog, d, costs $1 more than half the cost of a hamburger, h.

7. Example 6 You buy x pounds of cherries for $2.99 per pound. What is a function for the amount of change C you receive from a $50 bill? A.C = 2.99x – 50C.C = 50x – 2.99 B.C = 50 – 2.99xD.C = 2.99 – 50x

8. Example 7 A taxi cab $4.25 for the first mile and $1.50 for each additional mile. Write a function rule for this situation describing the total rate, r, for as a function of the total miles, m. What was the rate if the trip was 12 miles?

9. Try these… Write a function rule for each: 1.p is 9 more than half of q. 2.8 more than 5 times a number is -27. 3.A babysitter’s earnings, e, are a function of the number of hours, h, worked at a rate of $7.25 per hour. How many hours were worked if the total earnings were $54. 38? 4.A plumber’s charges $75 for a house call and $60 per hour for his work.