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Interesting extension focusing on unit analysis. Might be more appropriate in A1.
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Comparing prices with different sales tax rates.
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Nice connection between an equation, a table of values, and a graph.
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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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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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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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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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