Question

Write the slope of the line which is perpendicular to y-axis.

• A. 0
• B. 1
• C. -1
• D. Not defined

Answer 1

Answer: (A)

The correct option is A 0

Line perpendicular to $y-$ axis is the $x-$ axis.
Inclination of $x-$ axis is $0^0$.
Hence, the inclination of a line which is perpendicular to the y-axis is $0^0$.

Slope of line with an inclination $\theta =tan\theta$.

Hence, slope of line, with inclination $\theta ={90}^0$ is tan $0^0=0$.