Pre algebra

My problem says
The cost of a cell phone for one month is a linear function of the numbers of minutes used. The total cost for 20, 35, and 40 additional numbers Re shown.
Then it gives a table where it's 20/48$, 35/54$ and 40/56$

The first question is ,
Find the linear equation that represents the relationship between the number of additional minutes and total cost

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  1. X = Minutes used.
    Y = T0tal cost in Dollars.

    (X,Y), (20,48), (35,54), (40,56).

    m = (Y2-Y1)/(X2-X1)=(54-48)/(35-20) =
    0.40 = Slope.

    (20,48)
    Y = mX + b = 48
    0.4*20 + b = 48
    b = 40

    Eq: Y = 0.4X + 40

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