Standard Form
Horizontal & Vertical Lines
Examples
Example 1 Graph y = 4.
The only variable appearing is y. Regardless of which x-value is chosen, the y-value is always 4. All points with a y-value of 4 satisfy the equation. Thus the graph is a horizontal line 4 units above the x-axis.
![graph1-1 graph1-1](https://claregladwinresd.glk12.org/pluginfile.php/2268/mod_book/chapter/4307/Linear/images/graph1-1.png)
Example 2 Graph x = ?2.
The only variable that appears is x. Regardless of which y-value is chosen, the x-value will always be ?2. The resulting graph is a vertical line two units to the left of the y-axis.
![graph2-2 graph2-2](https://claregladwinresd.glk12.org/pluginfile.php/2268/mod_book/chapter/4307/Linear/images/graph2-2.png)