You can
put this solution on YOUR website!The line y = 8 is a horizontal line, and the slope of ANY horizontal line is 0. Any line parallel to a horizontal line is going in the same direction, so it has the same slope, ZERO.
Any line perpendicular to any horizontal line must be a vertical line, and the slope of a vertical line is undefined. So the slope of any line perpendicular to y = 8 is UNDEFINED.
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