You're talking about a vertical line, whose equation is [ x = a number ].
(Every other possible line has a defined slope.)
If 'a number' is not zero, then the line has no y-intercept, because it's parallel to the y-axis.
If 'a number' is zero, then the line is the y-axis.
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No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.
Undefined slope is a vertical line along the horizontal point of origin., the slope would have a denominator of zero, which is undefined.
Undefined.
The slope is undefined.
Sounds reasonable. If the lines are parallel, then their slopes are equal.