Question

Write the equation representing $y-$axis.

Answer 1

Find the equation representing $y-$axis:

$y-$axis is a vertical line perpendicular to $x-$axis.

As $x-$ coordinate of every point on the $y-$axis is $0$, equation of a $y-$axis is $x=0$.

Hence, equation of a $y-$axis is $x=0$.