SOLUTION: Please help: need to identify the independent and dependent variables and write a rule in function notation for the following: To rent a DVD, a customer must pay $3.99 plus $

Question 916049: Please help: need to identify the independent and dependent variables and write a rule in function notation for the following:
To rent a DVD, a customer must pay $3.99 plus $0.99 per day that the DVD is late.
We have come up with this: f(x)=3.99x+.99y; however, we are currently only using one variable. But, we believe that in order to find the dependent variable, we need to show "y" after .99. If this equation is in fact correct.
Thank you.
Answer by Hawksfan(61) (Show Source): You can put this solution on YOUR website!
The problem state "To rent a DVD, a customer must pay $3.99 plus $0.99 per day that the DVD is late." in the first sentence. From this the dependent variable the # of days and 3.99 is the constant. Therefore, the equation can look something like this:
f(d) = 3.99 + 0.99(d)

Here's another example similar...
The admission fee to a local carnival is $8. Each ride cost $1.50. The total
cost depends on the number of rides ridden plus $8. Let r = # rides ridden.
What is the function? the function f(r) = 1.50r + 8
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