Equation of a Horizontal and a Vertical Line

In this presentation we will discuss the very basics about the equation of lines. We will only touch basics about forming equations for horizontal and vertical lines. Only these two lines are very special basic lines which don't need a whole pane to draw them. Below is the lesson plan;

Keep in mind horizontal lines have zero slope and vertical lines have infinite (undefined slope). All the other lines have slopes with some values (positive or negative) and need quite a bit space on two dimensional grid.

We will discuss those lines and their equations in next lesson. For today just keep in mind that equation of horizontal line is "y = 0" and that of a vertical line is "x = 0".