Practice problem

When Is a Relation a Function?

+3 contributors

Contributors

Elise Molinaro
Victor Wang
Alex Federspiel
Trisha

A
Input to Output
1 to 45
2 to 15
3 to 60
4 to 30

B
Input to Output
1 to 15
2 to 30
3 to 45
4 to 60

C
Input to Output
15 to 1
30 to 2
45 to 3
60 to 4

D
Input to Output
1 to 15
2 to 15
3 to 15
4 to 15 — Image source: by Elise Molinaro

A music hall holds $200$ people. Each ticket costs $\$15$ . A function can be written that describes the total income of the venue as a function of the first $4$ tickets sold. $\\$ Which of the relations drawn above represents this situation?