Linear equation.

Question

Chitchat wireless charges $0.30 per minute plus a monthly base fee. In September, Maggie used 120 minutes and her bill was $51. Write and solve an equation to find out the cost if maggie uses 165 mintues in October.

Answer 1

Cost as a function of minutes used:

c(m) = 0.3m + f

 

c(120) = 0.3(120) + f = 51

36 + f = 51

f = $15 monthly fee

 

c(165) = 0.3(165) + 15 = $________

 

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