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We usually denote the slope of a line as M. Horizontal lines have a slope of zero. Mhorizontal line = 0 Verticle lines have a slope that is undefined. Note that the slope is not infinite, but is undefined. Mvertical line = undefined To write the equation of a horizontal or vertical line, we need to know if it's going to be a slope-intercept form or a point-slope form.

Q: What is the equation of a horizontal and a vertical line using standard slope form?

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A vertical line HAS NO slope! The slope is undefined in this case.

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A horizontal line has a slope of zero. The equation of a horizontal line is y = a.

On the standard Cartesian graph, horizontal lines have zero slope. They all have the equation Y = a number

When the slope is undefined, you know the line has to be vertical. Vertical lines only have an x in their equations. When you have the coordinates (2,4) with a vertical line, the equation for the slope intercept AND standard form would be the same thing: x=2

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A vertical line HAS NO slope! The slope is undefined in this case.

The slope (or gradient) of a vertical or horizontal line is zero.

A line with no slope is a vertical line. The slope is undefined, and cannot be represented by a real number. A horizontal line has a slope, but the slope is zero. Consider the "y = mx + b" form of the straight line equation. For a horizontal line the slope is zero, so y = 0x +b => y = b, which is the equation of a horizontal line. For a vertical line, there is no slope, so you can't substitute for m; the equation can't be written in the form y = mx +b. The equation of a vertical line has the form x = a.

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Vertical. Te horizontal like has zero slope ( no slope) and the vertical line has infinite (very very high) slope

An undefined slope is vertical.

The slope of a vertical line is undefined. Horizontal slope is 0.

I assume you mean y = -6. The slope of this would be zero since it is a horizontal line. For the equation x = -6, the slope would be infinite since this is a vertical line.

x = 4 is a straight line that is vertical when plotted on the xy graph, where y is the vertical axis and x is the horizontal axis. A vertical line has an infinite slope; the slope is infinity

a vertical line has an undefined slope, while a horizontal slope has a slope of zero.

No, the slope of a horizontal line is 0. The slope of a vertical line is undefined.

No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.