en.wikipedia.org/wiki/Horizontal_and_vertical

The usage of the inter-related terms horizontal and vertical as well as their symmetries and asymmetries vary with ...

en.wikipedia.org/wiki/Vertical%E2%80%93horizontal_illusion

The vertical–horizontal illusion is the tendency for observers to overestimate the length of a vertical line relative to a horizontal line of the same length. This involves a bisecting component that causes the bisecting line to appear ... Cross- cultural differences in susceptibility to the vertical–horizontal illusion have been noted.

www.reference.com/math/difference-between-vertical-horizontal-lines-9e8e73a2eba24c24

Horizontal lines are parallel to the horizon or parallel to level ground. They have a slope of zero and are parallel to the x-axis on a graph. Vertical lines are ...

answers.yahoo.com/question/index?qid=20080529120831AAuuq7K

Best Answer: a horizontal line goes in the same direction as the horizon like the line below ... Difference Between Vertical And Horizontal.

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 ...

mathforum.org/cgraph/cslope/horizontal.html

Horizontal and Vertical Lines. Lines that never slant up or down are called horizontal lines. Here is a picture of some horizontal lines: ...

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

Plotting a horizontal line and plotting a vertical line.

math.stackexchange.com/questions/836969/difference-between-horizontal-and-vertical-line-tests

The definition of a function requires that every x value has at most one y value. It doesn't require that every y value has at most one x value though, ...