The ordinate of an ordered pair (x, y) is its second component, i.e. it is y. The ordered pair (x, y) is used to denote a point in Cartesian Coordinate system. It is the second of the two terms by which a point is referred to, in a system of fixed Cartesian Coordinate axes. The first coordinate, i.e., "x" coordinate, is called the abscissa. Cartesian co-ordinate system specifies each point uniquely in a plane by a pair of numerical co-ordinates, which are the distances from the point to two fixed axes, measured in the same unit of length.
For example, we can say that for a point A, having coordinate (7, 8), has an ordinate 8. and a point P, having coordinate (8, -10), has an ordinate -10. In the first example, the ordinate is positive, we need to go 8 equal divisions from origin towards the positive direction of Y-axis, and for the second example, we have to go 10 divisions towards the negative direction of Y-axis, since it is -10.
This Graph is an illustration of a Cartesian coordinate system, having 4 distinct points marked. The 4 points are (2, 3) in green, (-3, 1) in red, (-1.5, -2.5) in blue, and (0, 0) the origin in purple. In the point (2, 3), While graphing the ordinate three divisions are covered in the positive direction of the Y- axis.
Likewise for the point (-1.5, -2.5), two and half divisions are marked from the origin (0, 0) towards the negative direction of the Y- axis, since the ordinate is negative.
The ordinate solely and entirely depends on the Y-axis. So While marking it, one needs to go along or parallel to the positive or negative direction of the Y axis.
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