Which ordered pair is a solution of y = x + 12? (24, 12) (9, 21) (–12, –24) (0, –12)

Afitness center has 2 membership plans one has a low dollar sign up fee of 15 dollars and costs 38 dollars per month to join. a second plan has a higher sign up fee of 78 dollars but a lower monthly fee of 31 dollars for what number of days of the month is the coat the same