Question

Write a function for the following real-world situation.

Let x = the number of minutes Maria spends on talking on the phone each month, and let y = Maria's monthly cost. The monthly fee for having the phone service is $39.99 with a charge of $.01 per minute of talk time on the phone. Write a function to represent the total cost each month for use of the phone.

Answer 1

Do what u got to do I don’t get it

Answer 2

x = number of minutes Maria spends talking on the phone each month
y = Maria's monthly cost

If she talks for x minutes, at $0.01 per minute, then she is charged 0.01*x dollars for those x minutes. This is on top of the $39,99 as the flat fee (which is charged no matter how many minutes are used; even if Maria doesn't use her phone at all)

So that means we add 0.01*x to 39.99 to get 0.01*x+39.99
This expression is equal to y as it is the total cost for that month

Therefore y = 0.01*x+39.99 is the equation
If you want things in function notation, then you'd replace y with f(x) to get
f(x) = 0.01*x+39.99