Lesson plan

Justify a solution to an equation by substituting for a variable

teaches Common Core State Standards CCSS.Math.Content.6.EE.B.5 http://corestandards.org/Math/Content/6/EE/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6

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Big Idea: A solution is a number that makes an equation true when substituted for an unknown. This lesson builds on using expressions to represent real-life situations by asking students to solve for variables in equations when given a solution set. In this task, students are given the total cost and the number of pounds of fruit that were purchased. Given a list of prices per pound, students need to determine which fruit was purchased. Students justify their solutions using substitution in algebraic equations and also draw visual models that represent the equation. This concept builds toward solving for a variable in an equation without being given a solution set. Vocabulary: variable, algebraic equation, substitute, solution, per Special Materials: none