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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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