A horizontal line would be of the form y= (a number). There should be no 'x's involved in the equation.
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For a horizontal line, it is y= a value
If there is no slope in a graph, it means that the line is horizontal. A horizontal line has a slope of zero. To graph a horizontal line, you simply draw a straight line that is parallel to the x-axis. The equation of a horizontal line is typically in the form y = k, where k is a constant value.
You would need a point ex: (4,5) y=5 if its a horizontal line you just write y=(value of y on the given point)
Assuming the point is (9, -4), the equation is y = -4.
It is a linear equation of the form y = c where c is some constant.