Question 307216
Customers of a phone company can choose between two service plans for long distance calls. The first plan has a $35 one-time activation fee and charges 7 cents a minute. The second plan has no activation fee and charges 12 cents a minute. After how many minutes of long distance calls will the costs of the two plans be equal? 


Let the number of minutes after which the they become equal be x

Convert call charges from cents to dollars

first plan will cost 0.07x + 35
Second plan will cost 0.12x

0.07x +35 = 0.12x

0.07x-0.12x= -35

-0.05x=-35

x=-35/-0.05

x=700 minutes

after 700 minutes they will become equal