Find the equation of a line which is 5 units distance above the x-axis.

The condition of the X-axis is y = 0. 

It is known that y = an is the condition of any line lined up with the x-axis, where an is the y-intercept of that line. 

Here, it has been given that the necessary line is 5 units distance over the x-axis. Thus we can believe 5 to be a for this line, or at least, a = 5. 

In that capacity, the condition of the necessary line is y = 5. 

Consequently, the condition of a line that is 5 units distance over the X-axis is y = 5 

⇒ y - 5 = 0.