Question

When making a telephone call using a calling​ card, a call lasting 44 minutes cost ​$1.151.15. A call lasting 1313 minutes cost ​$2.952.95. Let y be the cost of making a call lasting x minutes using a calling card. Write a linear equation that models the cost of a making a call lasting x minutes.

Answer 1

You have two points: (44,1151.15) and (1313,2952.95)
Find the slope m of the line joining those two points, and your equation is easy to find, using either of the two points:
y-1151.15 = m(x-44)
or
y-2952.95 = m(x-1313)