4. Ordered pairs

Let us draw a point in the graph. The point is denoted by \((a,b)\), where \(a\) is the distance along the \(X\) - axis and \(b\) is the distance along the \(Y\) - axis. This pair \((a,b)\) is called as the ordered pair. The ordered pair helps us identify the point correctly.

 

The \(x\) - coordinate in the ordered pair is called abscissa and the \(y\) - coordinate in the ordered pair is called ordinate.

 

Here, the ordered pair is \((a,b)\), where \(a\) is the \(x\) - coordinate or the abscissa, and \(b\) is the \(y\) - coordinate or the ordinate.