The ordered pairs (0, 0), (2, 4), (4, 8), and (6, 12) represent a function. what is the rule for this function? (1 point)
y = x +2
y = 3x
y = x + 4
y = 2x

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).