This Where's the Point? Follow-Up lesson plan also includes:
Ninth graders explore the graphs of vertical and horizontal lines. In this Algebra I lesson, 9th graders investigate the Cartesian plane and discover that all vertical lines have equations of the form x=k and all horizontal lines have equations of the form y=k. This lesson, which requires abTI-nspire handheld, is an introduction to the concept of graphing an equation.