# Lesson Plan: Graphing Special Lines Mathematics

This lesson plan includes the objectives, prerequisites and exclusions of the lesson teaching students how to recognize and graph vertical and horizontal lines, the lines 𝑦 = 𝑥 and 𝑦 = −𝑥, and lines of the form 𝑦 − 𝑥 = 𝑐 and 𝑦 + 𝑥 = 𝑐.

#### Objectives

Students will be able to

• understand that horizontal lines have equations of the form ,
• understand that vertical lines have equations of the form ,
• recognize when points are on a horizontal or vertical line described by an equation,
• write down the equation of a given horizontal or vertical line,
• understand that the lines with equations are diagonal lines through the origin,
• recognize lines with equations of the form when given a graph.

#### Prerequisites

Students should already be familiar with

• plotting points on a pair of coordinate axes,
• recognizing patterns within sets of coordinate pairs.

#### Exclusions

Students will not cover

• filling in tables of - and -values,
• the slope of a line.