This presentation is about using a simple math method called Simple Linear Regression (SLR) to see if there's a link between how much a car weighs and how much fuel it uses. We use a set of car data called mtcars to figure out how a car's weight affects how many miles it can go on a gallon of gas. We start by explaining what SLR is, go over some basic math behind it, and look at the rules this math method needs to work well. We also show you how to do this analysis using a programming language called R. By doing all this, we find out how important the connection between a car's weight and its fuel use really is, and what this means in the real world. We check our work carefully, look at how well our math model fits the data, and even use a cool 3D chart to make our data easy to see and understand. This talk isn't just about teaching SLR; it also shows how useful SLR can be in many different areas by helping us understand how two things can be connected.