Gina has purchased 100 songs from the internet. She plans to download an equal number of songs on her music player each week for 5 weeks. The graph shows the number of songs left to download, y, for a certain number of weeks, x:
A graph titled Song Downloading shows Number of Weeks on x-axis and Number of Songs Left to Download on y-axis. The x-axis scale is shown from 0 to 5 at increments of 1, and the y-axis scale is shown from 0 to 140 at increments of 20. A straight line joins the ordered pairs 0, 100 and 1, 80 and 2, 60 and 3, 40 and 4, 20 and 5, 0.
Part A: What is the rate of change and initial value of the function represented by the graph, and what do they represent in this scenario? Show your work to find the rate of change and initial value. (6 points)
Part B: Write an equation in slope-intercept form to model the relationship between x and y. (4 points)
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Answer:
y=−30x+150 is the equation in slope intercept form
Rate of change = -30
Intial valu =150
Step-by-step explanation:
Given that Ivy has borrowed 150 songs from her friend. She plans to download an equal number of songs on her music player each week for 5 weeks.
Initially there will be 150 songs left, next week 120 songs, and so on.
Thus there is a decrease of 30 songs every week.
Hence slope = -30
y intercept = 150 (initial songs left)
So equation of line would be
y = -30x+150y=−30x+150
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Step-by-step explanation:
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