Lesson 3 Skills Practice - 8TH GRADE MATH DEPARTMENT

[Pages:4]NAME _____________________________________________ DATE _____________________________ PERIOD _____________

Lesson 3 Skills Practice

Functions

Determine whether each relation is a function. Explain.

1.

2.

3. {(?2, ?7), (2, 1), (5, 7), (8, 13)}

5. x y 55 ?3 55 3 90 ?15 90 15

7.

4. {(?3, 2), (?3, 4), (5, 9), (5, 12)}

6. x y ?4 ?11 ?1 1 2 13 6 29

8.

Course 3 ? Chapter 4 Functions

NAME _____________________________________________ DATE _____________________________ PERIOD _____________

Lesson 3 Extra Practice

Functions

Determine whether each relation is a function. Explain.

1.

2.

3. {(5, 6), (5, 7), (7, 7), (7, 8)}

4. {(12, 14), (17, 16), (13, 14), (18, 16)}

5.

x y

1 4

2 4

3 5

2 2

6. x y 0 0 1 3.2 2 6.4 3 9.6

7. Brittany earns $11.50 per hour. Are her wages a function of the number of hours she works? Justify your response by creating a set of ordered pairs.

D: {-2, -1, 0, 1}

D: {-6, -4, -2, 0}

D: {-3, -2, -1, 0}

R: {-4, 0, 4, 9}

R: {0, 2, 4, 6}

R: {-7, -4, -1, 2}

Course 3 ? Chapter 4 Functions

NAME _____________________________________________ DATE _____________________________ PERIOD _____________

Lesson 3 Homework Practice

Functions

Determine whether each relation is a function. Explain.

1.

2.

3. {(5, -5), (5, 5), (6, -6), (6, 6)}

4. {(4, 11), (5, 13), (6, 15), (7, 17)}

5.

x y

25 -5

25 5

50 -10

50 10

6. x y 0 0 1 1.25 2 2.50 3 3.75

7. Nora earns $15.75 per hour. Are her wages a function of the number of hours she works? Justify your response by creating a set of ordered pairs.

Course 3 ? Chapter 4 Functions

NAME _____________________________________________ DATE _____________________________ PERIOD _____________

Lesson 3 Problem-Solving Practice

Functions

1. Strom works as a valet at the Westside Mall. He makes $48 per day plus $1 for each car that he parks. Make a table to show the total amount that Strom makes in one day if he parks 25 cars, 30 cars, 35 cars, and 40 cars.

2. Rico's Plumbing Service charges $80 for a service call plus $65 per hour for labor. Make a table to show the total amount that Rico's Plumbing Service charges if a job takes 1 hour, 2 hours, 3 hours, and 4 hours.

x y

x y

3. The perimeter of an equilateral triangle equals 3 times the length of one side. Find the perimeter of an equilateral triangle with sides 18 inches.

4. Courtney belongs to a health club that charges a monthly fee of $20, plus $85 to join. How much has she paid after six months?

5. The amount that Sunrise Library charges for an overdue book is $0.25 per day plus a $1 service charge. Are the charges a function of the number of days overdue? Justify your response by creating a set of ordered pairs.

6. Explain how to find the amount of the fine the library in Exercise 5 will charge for a book that is overdue by 12 days. Then find the amount.

Course 3 ? Chapter 4 Functions

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