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.
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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 \((0,0)\).