Head First Algebra

Chapter 5. Graphing: A picture’s worth 1,000 words

Sometimes an equation might be hiding things.

Ever looked at an equation and thought, “But what the heck does that mean?” In times like that, you just might need a visual representation of your equation. That’s where graphs come in. They let you look at an equation, instead of just reading it. You can see where important points are on the graph, like when you’ll run out of money, or how long it will take you to save up for that new car. In fact, with graphs, you can make smart decisions with your equations.

Edward’s Lawn Mowing needs help...

Edward has been running his own lawn mowing and bush trimming business for a couple of years now.

Here’s what his business looks like now:

• Edward charges $12 per lawn.

• Edward has 7 current weekly customers.

• Edward mows each yard once a week.

• Edward gets paid weekly.

Edward’s Lawn Service

Edward has a list of new things that he wants to buy so he can expand his business—he’s thinking long term. He’d like to find out when he’ll be able to purchase each of these items:

• Blade sharpener: $336

• Hedge trimmer: $168

• Bagger attachment: $504

Edward needs help to SEE what his financial future looks like.

Ed wants you to help ...