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when slope m=0 it is a straight horizontal line and when slope is vertical line..I mean what is the value for slope m to get vertical line?I think that for vertical line, slope is m=0 also.

Jobiar Hossain
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    no, slope of vertical line is undefined (due to division by $0$); slope $m=0$ is horizontal line – J. W. Tanner Jul 31 '19 at 21:19
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    A vertical line is not a function by the vertical line test, but you can think of the slope $m$ as $\pm \infty$. – parsiad Jul 31 '19 at 21:20
  • The slope is defined as $\frac{\Delta y}{\Delta x}$ in the case of a line for arbitary two points. For a vertical line, we can therefore not have slope $0$. But with $x=a$ , a vertical line can nevertheless be described. – Peter Jul 31 '19 at 21:23
  • why it is undefined it is very normal concept....A horizontal plane can have zero slope and zero is a number but infinity is not a number... – Jobiar Hossain Jul 31 '19 at 21:30

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