Rocko paid $12.50 for 25 game tickets.
Louisa paid $17.50 for 35 game tickets. What
is the constant of proportionality? (Example 3)

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).

the first domain and range set to the left is matched with the top relation, and the second set the set in the middle goes with the bottom relation.