D(−3, 2), E(3, 3), F(1, 1), S(9, −2), T(3, −1), U(5, −3)

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