How many large and small watermelons did he sell? Just use the given information to write and solve a system of equations! The two videos accompanying the lesson explain the substitution method and then introduce problem solving. The video presents three word problem examples with varying difficulty. This is the fourth lesson in a series of seven dedicated to solving linear systems.

Concepts

systems of equations, substitution method

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Additional Tags

math

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Instructional Ideas

• Present the video to the class; stop the video at optimal parts and allow individuals time to write the equations independently
• Use board work with the first 30 practice problems to check for understanding and find process errors

Classroom Considerations

• The lesson is meant for two class periods, but you might need extended time for your classes to be comfortable with this material
• Video is 14 minutes long
• The fourth lesson in a series of seven dedicated to solving linear systems

Pros

• Uses context throughout the lesson to give meaning to the process
• Problem set includes both numeric and word problems
• Provides an answer key

Cons

• None

Common Core

8.EE.C.8.b 8.EE.C.8.c