**The cost of going to the local fair is represented by the function, F(x) = 1.25x + 12. Where x represents the number of rides and F(x) represents the total cost including the price per ride and an admission fee.**

__Find x, when F(x) = 27. What does it mean in the context of this problem?__

__*I only know how to solve for y it would be much appreciated if someone could show me the steps to answering this question as I have a test in the morning, thanks*__

Guest Mar 14, 2019

#1**+1 **

F(x) = 1.25x + 12

When F(x) = 27, we have

27 = 1.25x + 12 subtract 12 from both sides

15 = 1.25 x divide both sides by 1.25

12 = x

This means that the number of rides = 12

(And the admission fee is $12 )

CPhill Mar 14, 2019

#2**+1 **

F(x) = 1**.**25x + 12

Find x when F(x) = 27

This isn't too complicated, just substitute 27 in place of F(x) and solve for x

Like this: 27 = 1**.**25x + 12

Swap sides of the equation 1**.**25x + 12 = 27 this isn't necessary, I just prefer the x on the left

Subtract 12 from both sides 1**.**25x = 27 – 12 = 15

Divide both sides by 1**.**25 x = 15/1**.**25 = 12

Guest Mar 14, 2019

edited by
Guest
Mar 14, 2019