Lesson plan

8. Graph inequalities (C)

teaches Common Core State Standards CCSS.Math.Content.7.EE.B.4b http://corestandards.org/Math/Content/7/EE/B/4/b
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
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Lesson objective: Understand that there are multiple values that make an inequality true and they can be shown on the number line.

Students bring prior knowledge of graphing inequalities from 6.EE.B.8. This prior knowledge is extended to discrete and continuous solutions as students learn to utilize context in graphing their solution sets. A conceptual challenge students may encounter is accounting for restrictions inherent in the context of a problem. 

The concept is developed through work with a number line, which can show multiple numbers in a solution simultaneously.

This work helps students deepen their understanding of numbers because the solution to an inequality can be an infinite number of values.

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they graph the numbers in the solution to a situation resulting in an inequality.

Key vocabulary:

  • inequality
  • isolate
  • variable