Acell phone package charges $39 even if 0 minutes are used during the month. each additional minute of talk time adds $0.07. what is the total cost if you talked on the phone for 10 hours during the month? using the formal y = mx + b

total cost = $ 81

Step-by-step explanation:

It is given that the fixed cost is $ 39

and the cost per minute is $0.07

Let us assume the number of minutes used be x

we have

total cost = cost per minute × number of minutes used  + fixed cost

we plug the given values, so we have

we need to find the total cost for 10 hours used

x= 10 hours = 10(60) minutes = 600 minutes

so we have total cost for x= 600 minutes

hence the total cost = $ 81

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