Posted by **Amy ** on Sunday, March 7, 2010 at 2:15pm.

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 -
**Reiny**, Sunday, March 7, 2010 at 2:34pm
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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