The start up cost to join eTunes music is $7.95 plus $0.95 per song downloaded. Write a linear equation that could be used to find how many songs he downloaded.
a. y = 0.95x + 7.95
b. y = 7.95x + 0.95
c. y = 0.95x - 7.95
d. y = - 0.95x + 7.95