The slope of a line can be 'seen' to be sloping uphill or to be sloping downhill. The examples so far have been sloping uphill as you look at the diagrams from left to right. When a line is sloping ...
Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x = k.
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