Question

Tom buys a new phone service. It costs $20 to install, and then costs $15 a month. Write an equation to show the cost of the phone (y) for any number of months (x).

Answer 1

let x-number of months
total cost be y
y= 20 + 15x --> because it says "$15 a month" plus fixed cost of $20

Answer 2

Well, you know it's going to start with y=, becasue that's what we are looking for. And we should know that somewhere in the is going to be the $20. But because the $20 is a one time thing, it doesn't have an variable. Then because x is months, and it's $15 a month, you need 15x. So, in the end, you get y=20+15x. :D

Answer 3

well-explained (^_^) @This_Is_Batman

Answer 4

Thank you! I enjoy helping. c: God bless you guys!