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Chapter 3 38 Glencoe Algebra 1

Skills PracticeProportional and Nonproportional Relationships

Write an equation in function notation for each relation.

1. 2.

3. 4.

5. 6.

7. GAMESHOWS The table shows how many points are awarded for answering consecutive questions on a gameshow.

Question answered 1 2 3 4 5

Points awarded 200 400 600 800 1000

a. Write an equation for the data given.

b. Find the number of points awarded if 9 questions were answered.

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Chapter 3 39 Glencoe Algebra 1

PracticeProportional and Nonproportional Relationships

1. BIOLOGY Male fireflies flash in various patterns to signal location and perhaps to ward off predators. Different species of fireflies have different flash characteristics, such as the intensity of the flash, its rate, and its shape. The table below shows the rate at which a male firefly is flashing.

Times (seconds) 1 2 3 4 5

Number of Flashes 2 4 6 8 10

a. Write an equation in function notation for the relation.

b. How many times will the firefly flash in 20 seconds?

2. GEOMETRY The table shows the number of diagonals that can be drawn from one vertex in a polygon. Write an equation in function notation for the relation and find the number of diagonals that can be drawn from one vertex in a 12-sided polygon.

Write an equation in function notation for each relation.

3. 4. 5.

For each arithmetic sequence, determine the related function. Then determine if the function is proportional or nonproportional. Explain.

6. 1, 3, 5, . . . 7. 2, 7, 12, . . . 8. -3, -6, -9, . . .

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