### Other traits of Vertical lines

- The equation of a vertical line does not have a y-intercept since a vertical line never crosses the y-axis. (link).
- The slope of a vertical line is undefined because the denominator of the slope (the change in X) is zero.
- Vertical lines help determine if a relation is a function in math.
- The equation of a vertical line always takes the form x = k, where k is any number and k is also the x-intercept .(link) For instance in the graph below, the vertical line has the equation x = 2 As you can see in the picture below, the line goes straight up and down at x = 2.

**Example 1 of a Vertical Line**

Equation: x = 1

**General Formula for the equation of a Vertical Line**

is x = K where k is the x-intercept