Precalculus (10th Edition)

The slope of the line can be determined by the equation: $m=\dfrac{y_2-y_1}{x_2-x_1}$ where $(x_1, y_1)$ and $(x_2, y_2)$ are two given points on the line. Here, we can substitute the coordiantes of the points $(2,0)$ and $(2,2)$ to obtain: $m=\dfrac{2-0}{2-2)}=\dfrac{2}{0}$ which is undefined. This means that the line is vertical. Plot the points and connect them using a line.