Decide whether a relation is a function

Question 1

Is this relation a function? (2, 0), (2, −3), (−5, −6), (−4, −3)

• A. Yes
• B. No

Question 2

Is this rule a function (one output for every input)? A whole number → a number whose square is it (e.g. 9 → 3 and −3)

• A. Yes
• B. No

Question 3

Is this relation a function? (−4, 2), (−4, 3), (9, −1), (0, −9)

• A. Yes
• B. No

Question 4

Is this rule a function (one output for every input)? Side length of a square → its area

• A. Yes
• B. No

Question 5

Is this relation a function? (5, −7), (−4, −8), (8, −2), (−3, −2)

• A. Yes
• B. No

Question 6

Is this rule a function (one output for every input)? Each student → their date of birth

• A. Yes
• B. No

Question 7

Is this relation a function? (−1, −4), (−1, −3), (−4, −4), (3, 4)

• A. Yes
• B. No

Question 8

Is this rule a function (one output for every input)? Each date of birth → the students born that day

• A. Yes
• B. No

Question 9

Is this relation a function? (2, 4), (−4, 2), (0, −8), (−4, 0)

• A. Yes
• B. No

Question 10

Is this rule a function (one output for every input)? A whole number → a number whose square is it (e.g. 9 → 3 and −3)

• A. Yes
• B. No

Question 11

Is this relation a function? (−1, −5), (−3, 9), (1, 2), (9, 9)

• A. Yes
• B. No

Question 12

Is this rule a function (one output for every input)? Each phone number → its owner's name

• A. Yes
• B. No

Question 13

Is this relation a function? (−5, −5), (−3, −5), (1, 5), (8, −5)

• A. Yes
• B. No

Question 14

Is this rule a function (one output for every input)? Each phone number → its owner's name

• A. Yes
• B. No

Question 15

Is this relation a function? (1, 6), (7, 0), (7, −3), (−1, 9)

• A. Yes
• B. No

Question 16

Is this rule a function (one output for every input)? A whole number → a number whose square is it (e.g. 9 → 3 and −3)

• A. Yes
• B. No