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Concept

Vertical Line

A vertical line is a line that runs parallel to the axis. A vertical line is drawn in the coordinate plane below.

Notice that the line passes through all points where the coordinate is This means that the same value corresponds to infinitely many values. Therefore, this line does not represent a function. In fact, no vertical line is a function. Similar to horizontal lines, vertical lines take the following form.

Here, is the intercept. The rule for the line above is

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