Lesson plan

# 10. Solve real-world systems (A)

teaches Common Core State Standards CCSS.Math.Content.8.EE.C.8c http://corestandards.org/Math/Content/8/EE/C/8/c
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2

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Lesson objective: Apply systems of equations to solve real-world problems.

This lesson provides an opportunity for students to apply their knowledge and understanding of solving systems of equations to a real-life situation. Students are asked to complete a purchase order with missing values by solving a system of equations.

Key Concept students will use:

• Write an equation in one variable to solve a system of equations.

Skills students will use:

• substituting an equivalent expression for a variable
• writing an equivalent equation by applying properties of equality (Grade 7, Unit 6)
• solving an equation in one variable (Grade 7, Unit 6)

Students engage in Mathematical Practice 2 (reason abstractly and quantitatively) as they reason about the relationships between quantities in a problem and use the relationships to solve a problem.

Key vocabulary:

• equivalent equations
• equivalent expressions
• properties of equality
• substitution