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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.
1 The x-value tells how the point moves either to the right or left along the x-axis. 2  This axis is the main horizontal line of the rectangular axis or Cartesian plane. 3  The y-value tells how the point moves either up or down along the y-axis. 4  This axis is the main vertical line of the rectangular axis or Cartesian plane. point in a plane contains two components where order matters! It comes in the form (x,y) where x comes first, and y comes second. 1  The x-value tells how the point moves either to the right or left along the x-axis.