Plot the following points on a graph sheet and join then.
(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(1,1),(2,2),(3,3),(4,4),(5,5)
and (6,6).
Observing the above graph.
1. All these points lie on a straight line.
2. The point whose xcoordinate is equal to ycoordinate lie on this straight
line.
3. Every ordered pair that satisfies the relation y = x corresponds to
exactly one point on the straight line.
4. The straight line is called the graph of y = x.
5. y = x is the equation of the straight line.
6. The set of ordered pairs satisfying the equation y = x is infinite.
The line extends infinitely on either sides.
