5-1 Horizontal and Vertical Lines
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Equation of the x-axis
Since it's a horizontal line, the equation for the x-axis is y = 0.
Equation of the y-axis
Since it's a vertical line, the equation for the y-axis is x = 0.
Vertical line
x = a where a is the constant value where it crosses the x-axis. (All points on the line have the same x value which is a.)
Horizontal line
y = b where b is the constant value where it crosses the y-axis. (All points on the line have the same y value which is b.)