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Algebra 2

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A rental car costs a minimum charge plus a fixed charge per mile driven. One customer was charged $60 for 160 miles of use. Another customer drove 280 miles and paid $90. Write an equation relating the total cost, C (in dollars), to the miles driven, x.

  • Algebra 2 - ,

    Let C = ax + b,

    from the data
    60 = 160a + b and
    90 = 280a + b

    solve these two, you should get a=1/4 and b=20

    then
    C = (1/4)x + 20

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