if you define y = constant then the slope of any constant is 0 so if you define the line y = 0 the slope of 0 is 0.
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If the original slope is 0, then the opposite reciprocal of 0 is still 0. Oops! Reciprocal of 0 (n/0) is undefined! A vertical line has undefined slope, the horizontal line has slope of 0.
The slope is undefined.
No slope is undefined i.e. a vertical line slope of 0 is a horizontal line... i believe...
Points: (-1, -1) and (0, 0) Slope: 1
Slope=0 Y-intercept=0