Question

At a zoo, youth tickets cost $5 and adult tickets cost $9. A group that purchased x youth tickets and y adult tickets spent $90 on tickets.

What is the domain of the relationship?

A.
x ≤ 5
B.
0 ≤ x ≤ 5
C.
0 ≤ x ≤ 18
D.
x ≤ 18

Answer 1

so, since x represents youth tickets, the lowest amount they can buy is 0 tickets (so x has to be greater than/equal to 0, narrowing us down to choices B+C

now, to determine the upper limit on x, assume the opposite scenario: they buy as many youth tickets as possible, and buy 0 adult tickets. divide (total amount they have) / (cost per youth ticket) to maximize the # of youth tickets. if you get a non-integer, round down to the nearest integer.