Kennedy signed up for a streaming music service where there's a fixed cost for monthly membership and a cost per song downloaded. Her total cost is given by the linear graph below. What does the slope of the line represent?
The cost to download 100 songs.
The cost to use the service for one month if zero songs are downloaded.
The total cost per month assuming one song is downloaded.
The change in the total cost for every one additional download.
The correct answer is: The change in the total cost for every one additional download.
The slope of a linear graph represents the rate of change between the two variables. In this case, the x-axis represents the number of songs downloaded, and the y-axis represents the total cost. The slope of the line indicates how much the total cost changes for each additional song downloaded.