Extra Set

Grade 8 · Unit 4 · L15 · Version A · FF08

Functions

Name ________________

Date ________________

Period ________________

1.
The mapping { (2, 1), (2, 7), (3, 8) } — is it a function?
Answer. no
Input 2 is paired with two outputs.
2.
The mapping { (1, 4), (2, 4), (3, 5) } — is it a function?
Answer. yes
Each input appears once.
3.
The mapping { (1, 4), (2, 4), (3, 5) } — is it a function?
Answer. yes
Each input appears once.
4.
The mapping { (1, 4), (2, 4), (3, 5) } — is it a function?
Answer. yes
Each input appears once.
5.
The mapping { (2, 1), (2, 7), (3, 8) } — is it a function? Write a complete answer — Theo will compare with a partner.
Answer. no
Input 2 is paired with two outputs.
6.
The mapping { (2, 1), (2, 7), (3, 8) } — is it a function? Write a complete answer — Owen will compare with a partner.
Answer. no
Input 2 is paired with two outputs.
7.
The mapping { (1, 4), (2, 4), (3, 5) } — is it a function? Write a complete answer — Malik will compare with a partner.
Answer. yes
Each input appears once.
8.
The mapping { (1, 4), (2, 4), (3, 5) } — is it a function? Write a complete answer — Priya will compare with a partner.
Answer. yes
Each input appears once.
9.
The mapping { (1, 4), (2, 4), (3, 5) } — is it a function? Write a complete answer — Owen will compare with a partner.
Answer. yes
Each input appears once.
10.
The mapping { (1, 4), (2, 4), (3, 5) } — is it a function? Write a complete answer — Elena will compare with a partner.
Answer. yes
Each input appears once.
11.
Think
Malik tried this problem:
The mapping { (1, 4), (2, 4), (3, 5) } — is it a function?
Malik wrote no. That is not correct. What is the right answer?
Answer. yes
Malik’s answer no is off. Each input appears once.
12.
Think
Mei tried this problem:
The mapping { (1, 4), (2, 4), (3, 5) } — is it a function?
Mei wrote no. That is not correct. What is the right answer?
Answer. yes
Mei’s answer no is off. Each input appears once.

Original extra practice. Keys are computed from the items, not guessed.

L15 · Functions