Add the equations. 3x - y = -1
+ -3x + 3y = 27
A. 6x - 4y = -28
B. -2y = -28
C. 4y = 28
D. 2y = 26

Please answer quickly and as accurately as possible, this is for a quiz! Thank you!

D . 2y = 26

Step-by-step explanation:

D. 2y = 26

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).