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Because if one of the pair of lines is going from bottom left to top right, the other is going from bottom right to top left.

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Q: Why does it make sense that slopes of perpendicular lines have opposite signs?
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Do slopes with parallel lines make sense?

Yes providing that the y intercepts are different but the slopes remain the same.


How many perpendicular lines does a nonagon have?

A nonagon is a nine-sided polygon. In a nonagon, each vertex can have two perpendicular lines passing through it, resulting in a total of 18 perpendicular lines in a nonagon. This is because each vertex can have one vertical and one horizontal line passing through it, which are perpendicular to each other.


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Why does it make sense knowing the diagonals of a quadrilateral are perpendicular is not sufficient to show the quadrilateral is a rhombus?

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What is the opposite of haunting?

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What is the different kinds of linear system according to slope?

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