What is the equation of horizontal and vertical?

Answer 1

The equation of a horizontal line is y = constant (e.g you might have y=2 if your horizontal line is 2 up the y axis).

For a vertical line the equation will be x=constant so if you wanted the equstion of the vertical line that crosses the x axis at 5 it would be x=5.

If you want the equations of the horizontal and vertical axis then they are:
horizontal axis: y=0
vertical axis: x=0

Answer 2

The equation of any horizontal line is

Y = a number

Answer 3

The equation of a vertical line is x = a where a is a constant.

Answer 4

x=a, where "a" equals the x-intercept (where the line crosses the x-axis)

Answer 5

x = n where n is any real number

Answer 6

y = 0

Answer 7

m=tanTHETA