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Sagot :
The slope is defined as ratio of change is y-coordinate to the corresponding change in x-coordiante. So formula for the slope is,
[tex]m=\frac{dy}{dx}[/tex]Part 1:
If line is horizontal, then y-coordinate remain same for the changes is x-coordinate, means if x-coordinate change by certain number then y coordinate does not change or value of dy is 0.
So slope of horizontal line is,
[tex]\begin{gathered} m=\frac{0}{dx} \\ =0 \end{gathered}[/tex]Thus slope of horizontal line is 0.
Part 2:
If line is vertical then x-coordinate remain same for the change is y -coordinates, means if y-coodinate change by certain number then change in x-cordinate is 0 or value of dx is 0.
So slope of vertical line is,
[tex]\begin{gathered} m=\frac{dy}{0} \\ =\text{undefined} \end{gathered}[/tex]Thus slope of vertical line is undefined.
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