Question 1093094
vertical and horizontal line passing through the point (-9,-1) which one is horizontal and which one is vertical
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Vertical and horizontal are arbitrary.
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(-9,-1) --> x = -9, y = -1
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The graph can be rotated 90 degs, and change which is vertical/horizontal.
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When you deal with 3-space, the x-y-z space, you see the vertical and horizontal are not defined.