The scatter plot shows the total number of songs downloaded on a popular music service. Graph where the x- axis gives years after 2009 and runs from zero to five and beyond. The y- axis gives songs in billions and runs from zero to forty and beyond. A scatter plot line intersects the y- axis at (0, 5).

What is the equation of the linear model using two points on the line?
A. y = x + 10
B. y = 5x + 5
C. y = 10x + 1
D. y = 8x + 2