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A vertical line is parallel to the y-axis of a coordinate graph and every point on the line has the same x-coordinate. Vertical lines have no defined slope.

www.virtualnerd.com/algebra-1/linear-equation-analysis/intercept/horizontal-vertical-lines/vertical-line-example

www.sparknotes.com/math/algebra1/writingequations/section4.rhtml

Similarly, in the graph of a vertical line, x only takes one value. Thus, the equation for a vertical line is x = a , where a is the value that x takes. Example 3: Write ...

www.mathsisfun.com/equation_of_line.html

Equation of a Straight Line. The equation of a straight line is usually written this way: ... What is the equation for a vertical line? The slope is undefined ... and ...

mathcentral.uregina.ca/qq/database/qq.09.06/alex3.html

Subject: Writing the Equation of a Vertical Line passing (Point1,Point2) Name: Alex Who are you: Student. How do I write an equation of a vertical line passing a  ...

A vertical line passing through the point (4, -3) means that for any value of y, x is always going to be equal to 4; the formula may be generally ...

www.coolmath.com/algebra/08-lines/08-graphing-horizontal-vertical-lines-01

Algebra > Lines > Horizontal and Vertical Lines ... It's a horizontal line! ... the graph of y = -2 is ... Finding the Equation of a Line Given a Point and a Slope.

www.ixl.com/math/algebra-1/equations-of-horizontal-and-vertical-lines

Fun math practice! Improve your skills with free problems in 'Equations of horizontal and vertical lines' and thousands of other practice lessons.

www.varsitytutors.com/hotmath/hotmath_help/topics/horizontal-vertical-lines

Equations of horizontal and vertical lines only have one variable. The equation x = 4 represents a vertical line which crosses the x-axis at the point (4, 0).