**You can graph equations with two
unknowns, but can you actually solve them?** You’ve been graphing
all kinds of expressions lately: C
and t, x, and y, and more. But what about actually
solving equations with **two variables**? That’s going to take more than one
equation. In fact, you need an equation for every unknown you’ve got. But
what then? Well, a little **substitution**,
a few **lines**, and an **intersection** are all you need to solve
two-variable equations.

It’s New Year’s Eve, and Zach has a bunch of people coming in just an hour. Problem is, he hasn’t made drinks yet...

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