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 ...

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.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 ...

mathforum.org/library/drmath/view/57310.html

What is the difference between an undefined slope and a slope of zero? ... A horizontal line has a slope which is the number zero. You might be ... If a line is just one degree away from being vertical then its slope is about 57.

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

What if we want to graph this? Hmm... It doesn't look like there's enough there! Where's the x? We're used to these:

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, ...

smallbusiness.chron.com/difference-between-vertical-horizontal-business-organizations-24915.html

The Difference Between Vertical & Horizontal Business Organizations ... such that the lines of responsibility and control are clear and the function of each layer ...

www.quora.com/What-is-the-difference-between-a-vertical-and-a-horizontal-market

A vertical market is one in which all of your customers are in one particular industry, regardless of where in the food chain they are. For example, the site ...