SOLUTION: The cost of a classified ad is based on a daily fixed rate plus a flat service fee. One day costs $3.50 and four days costs $8.00. Let x=the number of days the ad appears; let y=t

Question 903527: The cost of a classified ad is based on a daily fixed rate plus a flat service fee. One day costs $3.50 and four days costs $8.00.
Let x=the number of days the ad appears; let y=the cost in dollars.
The relationship between x and y is a linear function.
(a)From the information in the problem, make two (x,y) pairs.
(_,_) and (_,_)
(b)Using the two pairs from part (a) find the slope of the linear function.
(c)Now write an equation for the line in point-slope form (there are two correct ways to do this)
(d) Using the equation: find the cost of a 6-day ad
(e)Using the equation: how many days could an ad run, for the cost of $18.50?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
One day costs $3.50 and four days costs $8.00.
a) (1,3.5)(4,8)
b)m=4.5/3=1.5
b=-1*4.5/3*1+1*3.5=2
c)y= 1.5x+2
y=11
d)y= 1.5x+2
18.50= 1.5x+2
16.50=1.5x
x=11
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