– [Voiceover] As we start to graph lines, we might notice that they’re differences between lines. For example, this pink or this magenta line here, it looks steeper than this blue line. And what we’ll see is this notion of steepness, how steep a line is, how quickly does it increase or how quickly …
: https://www.khanacademy.org/math/algebra/two-var-linear-equations/slope/v/introduction-to-slope