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If the y coordinate does not change, it is a horizontal line.
The horizontal number line on a coordinate plane is called the x-axis, and the vertical number line on a coordinate plane is called the y-axis.
coordinate, or coordinate value
The straight line that best fits the data on a coordinate plane is the Line Of Best Fit.
A vertical line in the xy coordinate plane would represent the line of an equation such as x = 1 or x = -4.