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The vertical line is known as the y axis. It is nothing more than a measuring stick to count how far up or down a point is from the horizontal line. The horizontal line, then, is known as the x axis and measures the distance left or right from the vertical line.
On a graph, the x-coordinate is the number where the point/line is horizontally (left and right) at a specific time. It's what a coordinate becomes when it's divorced. The horizontal, laditudal distance. Think of it as the left and right coordinate. The y is the up and down one.