Lesson plan

# 15. Track practice (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.MP4 http://corestandards.org/Math/Practice/MP4

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Lesson objective: Apply knowledge of systems to solve a simple system with multiple variables and constraints.

This lesson provides an opportunity for students to apply their knowledge and understanding of two-variable systems to a real-life situation. Students are asked to solve multiple relationships to determine the running time of four runners, and then use this information to determine how they would place in a staggered-start 100 meter race.

Key Concept students will use:

• We can write and solve systems of linear equations in two variables to solve problems with multiple simultaneous constraints.

Skills students will use:

• Solve a simple system by substitution or by other algebraic methods. (Grade 8, Unit 11)
• Determine the unit rates and write a slope-intercept equation. (Grade 8, Unit 7)
• Use graphs or tables to find connections between multiple linear relationships. (Grade 8, Unit 7)

Students engage in Mathematical Practice 4 (Model with mathematics) as they solve multiple equations to determine individual running times. They then use tables, graphs, or equations to determine which runners would pass each other in a staggered race.

Key vocabulary:

• system of equations
• unit rate
• substitution