the definition of a vertical line is the the graph of an equation that can be written in the form x=a, the line passes through the x-axis at (a,0).
example would be x=2, what type of line does it form?
the equation has inly variable, x, and x is always equal to 2. We make a table where x is always 2 and we put in any values for y.
x=2
x. y. (x,y)
2. 1. (2,1)
2. 2. (2,2)
2. 3. (2,3)
then plot the points (x,y) on the graph, the vertical line passing through the x-axis at 2.
