The music website 'Totally Tunes' charges for song downloads according to the graph below. Write an equation to model this situation. Totally Tunes 17 16 15 13 12 11 10 1 1 2 3 4 7 Numberof Songs Cost ($)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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3. The music website 'Totally Tunes' charges for song downloads according
to the graph below. Write an equation to model this situation.
Totally Tunes
17
16
15
14
13
12
11
10
2
1
1
2
3
4
5
6
7
Number of Songs
Solution : Using the general formula C = (rate per item)n + (fixed amount)
We must determine the fixed amount: it is the vertical intercept on the graph,
which is 7.
Then we must determine the rate per song by calculating the slope of the line,
which is 1.50$/song
*(choose two points on the line and determine rise and run, slope = un
rise )
So the equation is :
C = (rate per item)n + (fixed amount)
C = 1.50n + 7
Cost ($)
Transcribed Image Text:3. The music website 'Totally Tunes' charges for song downloads according to the graph below. Write an equation to model this situation. Totally Tunes 17 16 15 14 13 12 11 10 2 1 1 2 3 4 5 6 7 Number of Songs Solution : Using the general formula C = (rate per item)n + (fixed amount) We must determine the fixed amount: it is the vertical intercept on the graph, which is 7. Then we must determine the rate per song by calculating the slope of the line, which is 1.50$/song *(choose two points on the line and determine rise and run, slope = un rise ) So the equation is : C = (rate per item)n + (fixed amount) C = 1.50n + 7 Cost ($)
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