Question

Describe a real-world situation that can be represented by a linear relationship?

Answer 1

Every few days, on my way home from work, I pull into Ahmad's
Friendly Fuel and fill up my car's gas tank. 

His price has been $2.29 per gallon for almost 4 years now, and it still is. 

I don't always buy the same amount of gas, but no matter how much I buy,
my cost always fits the linear equation ...

           Cost  =  (2.29) · (number of gallons)            dollars.