Introduction
Why learn about linear functions?
Joan loves to travel, but she doesn't have a lot of extra spending cash. She read on several travel blogs that an awesome way to see the world is to get a credit card that offers an air mile bonus, and use it for all the things you normally budget for like food, gas, and even school supplies. This way, a big chunk of your airfare can be paid for with air miles. She applied for and got a credit card with air miles. Joan has planned to use her air miles card for the following things each month:- gas = $30
- car insurance = $40
- mobile phone bill = $65
- groceries = $150
- entertainment - restaurants, movies, and live music = $50