That it is the average of the x values.
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The horizontal change is the change in x. If the line in horizontal then the horizontal change will just be its length.
The horizontal line in the Cartesian plane is called the x-axis or x-coordinate.
On the Cartesian plane the horizontal number line is the x axis.
A horizontal line would be of the form y= (a number). There should be no 'x's involved in the equation.
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.