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

So, what's the slope of this line? Grab two points and see? The slope of a horizontal line is 0! Since it's always hard to remember when these guys are horizontal and when they are vertical, I've got a sentence that will always save you... When you see y = -2, say this:

Worked examples identifying the equations and slope of horizontal and vertical lines. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

math.stackexchange.com/questions/2184413/does-a-horizontal...

For that it cannot be a function. What about horizontal lines? Because a horizontal line has only one output. ... Does a horizontal line represent a function? ... I know that a vertical line has infinite outputs. For that it cannot be a function. What about horizontal lines? Because a horizontal line has only one output.

en.wikipedia.org/wiki/Horizontal_and_vertical

Horizontal lines do not cross each other. Vertical lines do not cross each other. Not all of these elementary geometric facts are true in the 3-D context. In three dimensions. In the three-dimensional case, the situation is more complicated as now one has horizontal and vertical planes in addition to horizontal and vertical lines.

en.wikipedia.org/wiki/Horizontal_line_test

In calculus. A horizontal line is a straight, flat line that goes from left to right. Given a function : → (i.e. from the real numbers to the real numbers), we can decide if it is injective by looking at horizontal lines that intersect the function's graph.If any horizontal line = intersects the graph in more than one point, the function is not injective.

www.teacherbulletin.org/media/resources/v10LLL_07_Lines,_Lines...

Lines, Lines, Lines!!! Horizontal and Vertical Lines ~ Lesson Plan I. Topic: Horizontal and Vertical Lines II. Goals and Objectives: A. The students will understand the difference between horizontal and vertical lines. B. The students will graph the different type of lines. C. The students will find the equation of horizontal and vertical lines ...

www.hardycalculus.com/calcindex/IE_verticalline.htm

Home Contents Index. Vertical line test, Horizontal line test, One-to-one function. If no two different points in a graph have the same first coordinate, this means that vertical lines cross the graph at most once. This is known as the vertical line test. Graphs that pass the vertical line test are graphs of functions.

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

The graph of a relation of the form y = 5 is a line parallel to the x-axis because the y value never changes.. Note: A line parallel to the x-axis is called a horizontal line.. The graph of a relation of the form x = 5 is a line parallel to the y-axis because the x value never changes.. Note: A line parallel to the y-axis is called a vertical line.. Example 8. Plot the graph of each of the ...