A′
(-1, 3)
B′
(-2, 2)
C′
(-2, 1)
D′
(-1, 1)

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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