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Horizontal lines always have a slope of zero. (i.e completely flat, level surfaces have a slope of zero). However a line does not have to have a slope of zero in order to be a line.

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Horizontal lines

Q: Lines always have a slope of zero.?

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No. the slope of parallel lines would be equal but not necessarily zero. How many values can m have in " y=mx +b "? where m is the slope of the lines.

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

a slope of zero. horizontal is undefined

All parallel lines have a zero slope.

For vertical lines, when you try to figure out the slope, you get zero in the denominator - in other words, a division by zero.

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Yes. There is no positive or negative rise to generate a slope, and it cannot have a run of zero length.

No. Horizontal lines have zero slope. Vertical lines have infinite slope.

run as in slope of a line is zero . horizontal lines have no slope and vertical lines have a slope of zero

No. the slope of parallel lines would be equal but not necessarily zero. How many values can m have in " y=mx +b "? where m is the slope of the lines.

Horizontal lines always have a slope of 0.

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

When the lines are horizontal and vertical. (slope of zero) (undefined slope)

a slope of zero. horizontal is undefined

The parallel line would also have a slope of zero (both are horizontal lines).

The slope of a vertical line is undefined. It either slants straight up or straight down-- you can not say which. The formula for slope does not work in this case because the denominator is zero.

All parallel lines have a zero slope.