The equation of any horizontal line is
Y = a number .
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A horizontal line has a slope of zero. The equation of a horizontal line is y = a.
When the equation represents a horizontal line.
It is likely that a horizontal line on a graph will have the equation y=c, where c is a variable.
A straight horizontal line is a line that goes sideways, often represented by the equation y=a where a is any real number.
The equation is [ y = 3 ].