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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.
y-axis â(plural y-axes) ( 1 algebraic geometry) The axis on a graph that is usually drawn from bottom to top and usually shows the range of values of variable dependent on one other variable, or the second of two independent variables. 2  Finnish: y-akseli (fi)  French: axe des y (fr) m, axe des ordonnÃ©es f.