9th grade

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it cost $2 per day to place a one-line ad in the classifieds plus a flat service fee. one day cost $3 and four days cost $9.

write a linear equation that gives the cost in dollers, y, in terms of the nunber iof days,x.
find the cost of a six-day ad.

  • 9th grade -

    Actually you have more information than is necessary.
    "it cost $2 per day to place a one-line ad in the classifieds plus a flat service fee" ---> y = 2x + b
    "one day cost $3 " ---> x = 1, y = 3
    3 = 2(1) + b
    b = 1
    equation: y = 2x + 1
    (check: 4 days cost $9,
    y = 2(4) + 1 = 9, Check!

    so for 6 days
    y = 2(6) + 1 = $13

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