Chapter 1. What is Algebra?: Solving for unknowns...

Do you ever wish you knew more than know? Well, that’s what Algebra’s all about: making unknowns known. By the time you’re through this first chapter, you’ll already have a handle on X being a lot more than a mark where treasure’s buried. You’ll get a handle on equations, keeping both sides of an equation balanced, and why solving for unknowns really isn’t that big of a deal. What are you waiting for? Go on and get started!
It all started with a big gaming sale
Jo has been watching the game system battles for a while now and has finally decided on the one she wants. Her favorite system’s on sale this week, and she’s ready to buy. But can she afford it? That’s where she needs a little help from you.

What does a system really cost?
When you buy things—especially expensive electronic things—there are lots of pieces that add into the price besides just the number on a sales flyer: sales tax, an extended warranty, shipping and handling, etc. So what will a KillerX system really cost?
There’s tax on the system...
The base price of the system is $199. After that, we need to think about taxes, which are 5%. Let’s figure out how much Jo’ll have to pay in taxes:
... and the extended warranty, too.
Jo’s about to spend $199 on a game machine, and she ...
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