Assume a car uses gas at a constant rate. After driving $15$ miles since a full tank of gas was purchased, there was $18.8$ gallons of gas left; after driving $65$ miles since a full tank of gas was purchased, there was $14.8$ gallons of gas left. Use a function to model the amount of gas in the tank (in gallons). Let the independent variable be the number of miles driven since a full tank of gas was purchased. Find this function’s domain and range in this context.