The slope of a vertical line is:
0
1
90
not defined
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A vertical line is perpendicular to x-axis.
Thus, θ = 90°.
We know that,
m = tan θ
m = tan 90° = not defined
Hence, option 4 is the correct option.
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The slope of a horizontal line is:
2
A line which is neither parallel to x-axis nor parallel to y-axis, is called
a transverse line
an oblique line
a horizontal line
a vertical line