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## Collection Contents

### Illustrative Mathematics: Harvesting the Fields

by Wendy Lawson

Interesting extension focusing on unit analysis. Might be more appropriate in A1.
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### Illustrative Mathematics: Buying a Car

by Wendy Lawson

Comparing prices with different sales tax rates.
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### Illustrative Mathematics: Paying the Rent

by Wendy Lawson

Nice connection between an equation, a table of values, and a graph.
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### Illustrative Mathematics: How does the solution change?

by Wendy Lawson

This activity replaces a number with a parameter and asks the students to consider how the solution changes when the parameter is changed.
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### Illustrative Mathematics: Same Solutions?

by Wendy Lawson

Encourage students NOT to solve each equation. Equivalence arguments can be made without solving for x.
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### Stacking Cups Activity

by Wendy Lawson

Linear equation from a stack of cups. The folder includes several versions of the activity.
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### Flexbook from CK-12, Equations of Lines

by Dan Coonce

This chapter begins with one-step equations involving addition, subtraction, multiplication, and division. It then moves on to more sophisticated equations that require two or multiple steps to solve. Here, you’ll learn how to combine like terms. Next, it introduces equations that have variables on both sides of the equal sign. Ratios and proportions are also discussed as are problems that entail scales and indirect measurement. The chapter concludes with a thorough discussion of percentages, an introduction to the percent equation, and a collection of real-life problems that involve percent of change.
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### FlexBook from CK-12.org, Linear Inequalities

by Dan Coonce

To help students visualize inequalities, this chapter begins with graphing them on a number line. It then moves into solving inequalities that entail one and multiple operation(s) to isolate the variable. Next, writing, graphing, and solving compound inequalities are introduced. From there, the chapter transitions into absolute value equations and inequalities, with special attention paid to analysis and graphing of them. It concludes with graphing of linear inequalities in two variables and solving real-world problems using linear inequalities.
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