The graph represents a system of inequalities for the scenario where x is the number of confirmed parties on
a tour and y is the number of required copies of the
itinerary. Which constraint could be part of this system
of equations?
At least 2 copies are required per tour.
More than 2 copies are required per tour.
The number of confirmed parties must be at least
double the number of required copies.
The number of confirmed parties must be no more
than double the number of required copies.

alright well the answers to your question is

2xy/9 hope this have a nice day : )

step-by-step explanation:

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).