algebra
posted by jack .
George is starting a new streaming music service. For a monthly fee, you can stream 50 songs. There is an additional charge for each song over 50. In August, Bill was charged $11.22 for 67 songs and in September he was charged $13.50. Write a function for the total charge. What is the monthly membership fee? What is the additional amount charged per song?

c = m if n<50
c = m + a(n50) if n>/= 50
11.22 = m + a (6750)
is
11.22 = m + 17 a
13.50 = m + a(n 50)
you have to know n, the number of songs in September.
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