math

The monthly cost (in dollars) of a long-distance phone plan is a linear function of the total calling time (in minutes). The monthly cost for 40 minutes of calls is $12.18 and the monthly cost for 97 minutes is $17.31. What is the monthly cost for 54 minutes of calls?

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  1. m (the slope) = (17.31-12.18)/(97-40) = .09
    y = mx + b = .09x + b
    if i plug a point into the equation, i get b
    12.18 = .09(40) + b
    b = 11.82
    y = .09(54) + 11.82 = $16.68
    :)

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  2. it was $13.44

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  3. sorry molly you're right
    i put in calculator 12.18 = .09(4) + b instead of 12.18 = .09(40) + b

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