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1. For any point $$P$$ on the $$x$$-axis, the value of $$y$$ coordinate (ordinate) is zero. That is, $$P(x,0)$$.
Example:
Let $$x$$-coordinate of the point is $$4$$, but $$y$$-coordinate of the point is $$0$$, then the points will be, $$(4,0)$$. Here the ordinate is $$0$$.
2. For any point $$Q$$ on the $$y$$-axis, the value of $$x$$ coordinate (abscissa) is zero. That is, $$Q(0,y)$$.
Example:
Let $$x$$-coordinate of the point is $$0$$, but $$y$$-coordinate of the point is $$-3$$, then the points will be, $$(0,-3)$$. Here the abscissa is $$0$$.