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  4. Let a horizontal line L is at a distance ' a ' from the X-axis. I. If line L is above the X-axis, then its equation is y=-a. II. If line L is below the X-axis, then its equation is y=a.

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Q. Let a horizontal line $L$ is at a distance ' $a$ ' from the $X$-axis.
I. If line $L$ is above the $X$-axis, then its equation is $y=-a$.
II. If line $L$ is below the $X$-axis, then its equation is $y=a$.

Straight Lines

Solution:

If a horizontal line is at a distance a from the $X$-axis, then equation of the horizontal line above or below the $X$-axes is $y=a$ or $y=-a$, respectively.

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