If a line is vertical then it has an undefined slope.If a line has an undefined slope, then it is a vertical line.If a line is not vertical then it does not have an undefined slope.X If a line does not have an undefined slope, then it is not a vertical line.
If a line is vertical then it has an undefined slope.If a line has an undefined slope, then it is a vertical line.✔ If a line is not vertical then it does not have an undefined slope.If a line does not have an undefined slope, then it is not a vertical line.
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