# Lesson Plan: Solving Systems of Linear Equations Graphically Mathematics • 8th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to solve a system of two linear equations by considering their graphs and identifying the point of intersection.

#### Objectives

Students will be able to

- understand that the solution set of a system of equations is graphically represented by the point or points at which the lines intersect,
- understand the possible solution cases when solving a system of linear equations, particularly that
- an independent system of linear equations (nonparallel lines) has one solution,
- a dependent system of linear equations (coincident lines) has an infinite number of solutions,
- an inconsistent system of linear equations (parallel lines) has no solution,

- identify how many solutions a system of linear equations has when given the graph of the system,
- find the solutions to a system of linear equations when given the graph of the system, the graph and the two equations, the graph only, or the two equations only (by constructing a graph).

#### Prerequisites

Students should already be familiar with

- equations involving two variables,
- the equation of a straight line in slope–intercept form,
- graphing linear functions.

#### Exclusions

Students will not cover

- systems of equations involving more than 2 variables,
- solving systems of equations algebraically.