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en.wikipedia.org/wiki/Vertical_bar

The vertical bar ( | ) is a computer character and glyph with various uses in mathematics, computing, and typography. It has many names, often related to particular meanings: Sheffer stroke (in logic), verti-bar, vbar, stick, broken bar, vertical line, vertical slash, bar, glidus, obelisk, or pipe ...

Worked examples identifying the equations and slope of horizontal and vertical lines.

www.mathwarehouse.com/algebra/linear_equation/vertical-line.php

Graphs, equations and properties of vertical lines explained with pictures and examples.

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

You may be able to guess that vertical lines are lines that go straight up and down, but did you know that all vertical lines have the same slope? In this tutorial  ...

www.mathopenref.com/coordvertical.html

Definiton and equation for a vertical line in coordinate geometry.

www.mathsteacher.com.au/year8/ch15_graphs/05_hor/ver.htm

Plotting a horizontal line and plotting a vertical line.

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

Horizontal and Vertical Lines. What if we want to graph this? y = -2. Hmm... It doesn't look like there's enough there! Where's the x? We're used to these: Ax + By ...

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).

www.ixl.com/math/algebra-1/graph-a-horizontal-or-vertical-line

Fun math practice! Improve your skills with free problems in 'Graph a horizontal or vertical line' and thousands of other practice lessons.