https://www.khanacademy.org/math/cc-eighth-grade-math-essentials/x3ef2ca3186360389:linear-equations-and-functions 2026-07-01T15:45:19.26393441Z Linear equations and functions When distances, prices, or any other quantity in our world changes at a constant rate, we can use linear functions to model them. Let's learn how different representations, including graphs and equations, of these useful functions reveal characteristics of the situation. unit