# Solving Linear Systems of Equations with Substitution (Day 1 of 3)

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## Objective

Students will solve linear systems of equations using substitution.

#### Big Idea

Students will understand the idea of substitution with symbolic and written comparisons.

## Do-Now

10 minutes

Students will be solving systems of equations using substitution in today's lesson, so today's Do Now gives students an opportunity to practice solving a linear equation. After 5 minutes, I will ask student volunteers to come to the front of the room to show their answers on the board.

Next, I will ask a student will read the objective, "SWBAT solve systems of equations using substitution". I will ask the class to define "substitution", and to give some real world examples of when a substitution would be made.

## Opening

10 minutes

Students will complete the "Math Lib" on Slide Two of today's presentation. The purpose of this activity is for students to make a connection between equality and idea of one thing representing another. Students will create their own unique list on the back of their Do-Now sheet, using the criteria on the board.

Next, I will tell students to turn and talk with the people sitting around them, sharing their version of the story with their set of words inserted. I will also ask a few volunteers to share their story aloud for the class. Before moving on, I will ask the students to hypothesize why they think I chose to have them complete a Math Lib, when today's objective is to solve a linear system with substitution.

## Guided Notes + Practice

30 minutes

After the opening, students will continue to follow along with this presentation, while taking notes using this graphic organizer.

The video below shows how I will present these ideas in front of the class:

## Independent Practice

20 minutes

I will ask students to use the rest of class to practice solving systems of equations using substitution. Students will use a Pre-Algebra and an Algebra handout from the Kuta Software website:

Since they were used during our last class, I want my classes to begin feeling more comfortable with a graphing calculator.  Today, I will ask students to use a TI-Inspire calculator to check solutions as they move along on the handout. I will ask students to complete two to three problems at a time, then to stop to check their solution in the calculator before moving forward to the next one. If their solution does not match with the calculators, I will ask students to work in a pair with me or another student to help get them back on the right track.

## Closing

10 minutes

I will ask the students to describe how the computer phrase "copy and paste" would be a great analogy to describe solving a system with substitution. Next, a volunteer will be asked to give a short summary of what we learned in class today. Students will then complete an exit card.