Why does any of this matter? Because life is full of linear relationships. You’re comparing cell phone plans? That’s a slope and intercept. Budgeting for pizza and movies? Two variables. Even your commute time vs. traffic—linear-ish, if you’re lucky.
Next time you’re at a coffee shop and you see a graph on a menu showing “price vs. size,” you can whisper to your friend, “That’s a linear equation.” They’ll think you’re a wizard. Just play along.
