4.1.3 Writing Function Rules − Practice
1. Determine a relationship between the x - and y -values. Write an equation. x 1 2 3 4 y − 4 − 3 − 2 − 1
2. Determine a relationship between the x - and y -values. Write an equation. x 1 2 3 4 y 2 4 6 8
4. For f ( x ) = − 4 x + 2, find f ( x ) when x = − 1.
3. Find the missing value in the table. x
0 1 2 3 4
y
3
− 2
− 7
− 12
6. Identify the dependent and independent variables in the situation. You can get a higher score on your math test when you spend more time studying. 8. Brian has 64 flowers for a big party decoration. In addition, he is considering buying flower arrangements that have 18 flowers each. All of the arrangements cost the same. Brian can buy up to 5 arrangements given the amount of money he has. Let x represents the number of flower arrangements Brian buys. Write a function rule to describe how many flowers Brian will have based on the number of arrangements he buys. Find a reasonable range for the function.
5. Find f (50).
= + f m m ( ) 3 5
5
7. Identify the independent and dependent variables. Then, write a rule in function notation for the situation, letting x represent the independent variable. A hair stylist’s fee is $20 for each haircut.
9. Shari is participating in a charity run. Donors have pledged $300 plus $10 per mile. She can choose to run for 5, 10, or 15 miles. Write a function rule to describe this situation and give the domain and range of the function.
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