Vertical Line
A vertical line is the graph of a linear equation that contains only the variable , written in the form . In this equation, the -value is the constant and is completely independent of . Because the -coordinate never changes regardless of the -coordinate, plotting its points produces a straight line that runs straight up and down, crossing the -axis exactly at the point (a, 0). To graph it using a table of values, the constant is entered for every -coordinate, while any arbitrary values can be selected for the -coordinates.
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