posted by Mary
Adrienne had a party at a local bowling alley. She spent seventy-five dollars for the lane and five dollars per person for shoes. Let c be the total cost of the lane and shoes, and let f be the number of friends at her party. Write an equation to represent the problem. Which is the dependent variable? Explain.
C = 75 + 5f.
C is the dependent variable. It depends on the value of f.
c = 75 + 5 f
cost c depends on number of friends f
This question could have been written another way around.
Lets see how many friends Adrienne is can spend 5 dollars on in addition to spending 75 on the rental for amount in her budget c
f = (c - 75)/5
NOW f depends on c
but the equation is really the same
5 f = c - 75
75+5f = c