- The Y-axis on a cartesian graph is a
**vertical line up-down**that passes through the zero-point origin and measures the y- coordinate of points in the ordered pair (x, y). It is marked with negative values below the origin and positive values above.

www.storyofmathematics.com/glossary/**y**-**axis**/- The Y-axis on a cartesian graph is a

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**y**-ax· is ˈwī-ˌak-səs 1 : the**axis**of a plane Cartesian coordinate system parallel to which ordinates are measured 2 : one of the three axes in a three-dimensional rectangular coordinate system Word History First Known Use 1875, in the meaning defined at sense 1 Time Traveler The first known use of**y-axis**was in 1875**Y Axis****Definition**(Illustrated**Mathematics**Dictionary)**Definition**of**Y Axis**more ... The line on a graph that runs vertically (up-down) through zero. It is used as a reference line so you can measure from it. See: Coordinates Cartesian CoordinatesThe

**y**-**axis**is one of the two number lines that make up a 2D rectangular coordinate system (or one of three in a 3D coordinate system). The**y**-**axis**is almost always the vertical**axis**in a 2D rectangular coordinate system. The other number line in a 2D rectangular coordinate system is the x-**axis**.In

**mathematics**, an**axis**is a line with different meanings depending on the context. In a coordinate system, the axes are the reference lines (named the x- and**y**-**axis**) that form the coordinate plane. In the context of symmetry and rotation, an**axis**is the line that the object is reflected or rotated about.**Axis**of a coordinate system**y-axis**noun a reference**axis**, usually vertical, of a graph or two- or three-dimensional Cartesian coordinate system along which the**y**- coordinate is measured Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012