Yes. For example, the lines x=7, x=-1, and x=145 all have an undefined slope; they are all vertical.
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it means that the line in the linear equation is a vertical line
the difinition of undefined slope
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An horizontal line . A line parallel with the x-axis. NB A vertical line / a slope parallel with the y-axis is described as 'undefined'.
No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.