The slope of a horizontal line is:
0
1
2
not defined
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A horizontal line is a line parallel to the x-axis.
Thus θ = 0°
We know that,
m = tan θ
m = tan 0° = 0
Hence, option 1 is the correct option.
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The inclination of y-axis is:
0°
45°
90°
180°
The slope of a vertical line is:
90