Unit 2, Lesson 15
Off the Line
Extra Support Materials for Algebra 1
These materials, when encountered before Algebra 1, Unit 2, Lesson 15, support success in that lesson.
Preparation
Lesson Narrative
In this lesson, students practice finding simpler, equivalent equations in order to solve for an unknown. In the row game, students notice that multiplying an equation by a number results in the same answer for the unknown. In the other activity, students follow a plan to determine the weights of two different items by finding the weights of different groupings and combining their weights.
Students have multiple opportunities in this lesson to construct viable arguments and critique the reasoning of others as they discuss and analyze others’ processes (MP3).
- Explain (orally) that a multiple of an equation has the same solution as the original equation.
- Use a concrete example to recognize moves that can be done to a system of equations without changing the solution.