Suppose a 5-minute overseas call cost $5.91 and 10 min call cost $10.86. the cost of the call and the length of the call are linearly related. the each minute is constant.
what is the cost, c, of all of m minutes’ duration

Can you me with this question? i'll reward *30 points i just need with this one question so that i could solve the others. * edit: i originally set up the question to reward 30 points, but for some reason i can only reward 15. if you don't get 30, then i'm sorry. i'm still kind of new to this site