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algebra

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A 3-mi cab ride costs $3.00. A 6-mi cab ride costs $4.80. Find a linear equation that models cost c as a function of distance d. write your linear equation using function notation.

  • algebra - ,

    c = f(d) = m d + b

    3 = m (3) + b
    4.8 = m (6) + b

    subtract
    -1.8 = -3m
    m = 1.8/3 = .6

    find b
    3 = .6 (3) +b
    b = .4(3) = 1.2
    so
    c = .6 d + 1.2

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