Question

Suppose that the monthly cost of a long-distance phone plan (in dollars) is a linear function of the total calling time (in minutes). When graphed, the function gives a line with a slope of 0.09 . See the figure below.

The monthly cost for 31minutes of calls is $13.36. . What is the monthly cost for 26 minutes of calls?

Answer 1

(13.36 - y ) / ( 31 - 26) = .09

Can you find y is monthly cost of 26-minute call?

Answer 2

how do u do that?

Answer 3

what is 31-26?

Answer 4

then multiply by .09

Answer 5

55.6??