SOLUTION: By your cell phone contract, you pay a monthly fee plus some money for each minute you use the phone during the month. In one month, you spent 280 minutes on the phone, and paid $2

Algebra ->  Linear-equations -> SOLUTION: By your cell phone contract, you pay a monthly fee plus some money for each minute you use the phone during the month. In one month, you spent 280 minutes on the phone, and paid $2      Log On


   

Question 1188753: By your cell phone contract, you pay a monthly fee plus some money for each minute you use the phone during the month. In one month, you spent 280 minutes on the phone, and paid $29.40. In another month, you spent 400 minutes on the phone, and paid $36.00. What is the rate (in dollars per minute) that the phone company is charging you?
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
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To find the rate, take the difference of money, $36.00 - $29.40, and divide it by 400-280 = 120, the difference of minutes.


When you take the difference of money, you cancel the monthly fees, so this difference is paid for 120 minutes.

When you divide the difference of money by 120 minutes, you get the rate per minute.