Credit remaining on a phone card in dollars is a linear function of the total calling time made with the card in minutes. The remaining credit after 22 minutes of calls is $16.70 in the remaining credit after 49 minutes of calls is $12.65. What is the remaining credit after 69 minutes of calls?

Answer rating: 100% (QA)

Lets assume the remaining credit after x minutes of calls is represented by y doll... View the full answer