Introduction

This unit will begin as a review of graphing lines in a coordinate plane. This will include finding slope from points, graphs and equations. You will also review how to graph a line on a coordinate plane by using information from a linear equation in slope intercept form.

You may be thinking, "I don't remember much of this." Don't worry! That is why we are spending the first part of the unit reviewing. After the review you will apply this knowledge to determine if multiple lines are parallel or perpendicular by analyzing information from graphs and linear equations.

Review slope at GeoGebra - Exploring Slope.

Lesson Objectives

Following successful completion of this lesson, students will be able to...

  • Use slope formula to find slope between two points on a coordinate plane
  • Write an equation of a line in slope intercept

Essential Questions

  • What does the slope a line tells you about the line?
  • How are parallel lines and perpendicular line different?
  • What does the equation of a line tell you about graph of the line?

Enduring Understandings

  • The slope of a linear equation represents a constant rate of change.
  • Linear relationships can be defined on the coordinate plane.
  • The characteristics of linear equations and their graphs are useful in solving real-world problems.
  • Slope can be used to prove that two lines are parallel or perpendicular.
  • Slope can be used to prove that two lines are parallel or perpendicular.

The above objectives correspond with the Alabama Course of Study: Prepares for Geometry standard: 2b, 5, 15, 15a, 15b.