posted by Geno .
Customers of a phone company can choose between two service plans for long distance calls. The first plan has an $18 one-time activation fee and charges 10 cents a minute. The second plan has no activation fee and charges 15 cents a minute. After how many minutes of long distance calls will the costs of the two plans be equal?
Try to make two equations, one for each phone company.
y = .10x + 18
y = .15x
Try plugging in numbers until the two equations have the same y. If you need anymore explanations, just respond back.
Hope I helped!