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If a line has a slope of zero, how is it oriented?

User Cedmundo
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We can find the slope of any line by thinking about the changes in its x-y coordinates, given by the formula:


(y_1 - y_2)/(x_1 - x_2), \text{ } x_1 \\eq x_2

For there to be a slope of zero, then the two y-ordinates must be the same, given the x-ordinates aren't the same.

This resembles our horizontal line, given by the equation:

y = a,\text{ }a \in \mathbb{R}

We know this because the changes in the y-ordinate is zero, giving us a gradient/slope of zero.
User Hrv
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A line with a slope of zero is a horizontal line having the general equation of y = b.
User Xkill
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