Reflection: Intervention and Extension Solving Formulas - Section 2: New Info/Application


Students may struggle with solving formulas for a particular variable, despite being able to solve for a variable with equations involving numbers. 

A strategy I use when this occurs is modeling the process. I ask students to solve each pair of equations below. First, they must solve the single variable equation of the left, and then, solve its partner equation to the right.

  1. Solve for x:  2 = x + 3                   Solve for b:  a = b + c          
  2. Solve for x:   7x - 4 = 17               Solve for w:  7w - x = y              
  3. Solve for x:  (x + 4)/3  = 8           Solve for q:   (q + r)/t     =    u

I want students to focus on the structure of each equation and I try to help them see the relation between the two processes. I encourage them to try to treat variables as numbers. Students need to see that variables represent numbers, and they can treat them the same way (MP7, MP8). 

  Scaffolding Students work with Formulas
  Intervention and Extension: Scaffolding Students work with Formulas
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Solving Formulas

Unit 2: Solving Linear Equations
Lesson 9 of 10

Objective: SWBAT solve a formula for one of the variables

Big Idea: This lesson extends the concept of solving a linear equation in one variable to solving a formula for a particular variable.

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3 teachers like this lesson
Math, solving equations, Algebra, Linear and Nonlinear Equations, linear equations (graphs), properties of equality, 8th grade math, Solving formulas, Solve for one variable
  60 minutes
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