### Theory:

The $$x$$-coordinate is also called the abscissa. The $$y$$-coordinate is also called the ordinate.
Example:
Here the coordinates are $$L$$, $$M$$, $$N$$ and $$Q$$.
• The position of $$L$$ is $$(3,4)$$.
• The position of $$M$$ is $$(-4,2)$$.
• The position of $$N$$ is $$(-2,-3)$$.
• The position of $$Q$$ is $$(1,-3)$$.
• The abscissa of $$L$$, $$M$$, $$N$$ and $$Q$$ are $$3$$, $$-4$$, $$-1$$ and $$1$$, respectively.
• The ordinate of $$L$$, $$M$$, $$N$$ and $$Q$$ are $$4$$, $$2$$, $$-3$$ and $$-3$$, respectively.
Important!
What are the coordinates of the origin $$O$$? It has zero distance from both the axes so that its abscissa and ordinate are both zero. Therefore, the coordinates of the origin are $$(0,0)$$.