If a phone card is used to make a long distance phone call, you are charged $0.50 per call plus an additional $0.31 per minute.

Question

Part A: Write an equation that can be used to find the total cost of a phone call that lasts for m minutes.

Part B: Shalon was charged $5.15 after using a phone card to make a phone call. For how many minutes did he talk on the phone?

Answer 1

0.50 + 0.31m

Part B -- what do you think?