Unit 4, Lesson 9
When Are They the Same?
Grade 8
Preparation
Lesson Narrative
In this lesson students apply their knowledge of solving equations by considering real world situations. Using the given expressions for each situation, students are asked to determine when certain quantities are the same. Students should notice that they can set expressions equal to each other to solve for the variable of interest.
The work in this lesson introduces students to a simple form of solving systems of equations in which equations solved for the same variable can be set equal to one another as a basic form of substitution.
- Create an equation in one variable to represent a situation in which two conditions are equal.
- Interpret the solution of an equation in one variable in context.
Let’s use equations to think about situations.
Required Preparation
None