Question

It costs a general admission fee of $6 to get into the fair and then $1 for each ride.
Which of the following equations would represent the total cost to ride x rides at the fair?
f(x) = 6x
f(x) = 7x
f(x) = 6 + x

Answer 1

The last one. 6 is the fixed constant, while 1x depends on how many x rides you took.

Answer 2

f(x) = 6 + x
This is because we have to give 6 dollars, and if we'd take x number of rides, we'd get 6 + x
Okay?

Answer 3

ok @ParthKohli