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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.
By Deb Russell. Definition: The vertical and horizontal lines that make up the quadrants of a coordinate plane. The vertical axis is usally referred to as the y axis and the horizontal axis is usually referred to as the x axis. Pronunciation: axiz.Also Known As: X and Y axis. Examples: Use the coordinate grid to plot the numbers on the x and y axis.y Deb Russell. Definition: The vertical and horizontal lines that make up the quadrants of a coordinate plane. The vertical axis is usally referred to as the y axis and the horizontal axis is usually referred to as the x axis. Pronunciation: axiz.