or
or
(y-y1)/(n-n1)=(y1-y2)/(n1-n2)
(y-3)/(n-0)=(3-6)/(0-3)
(y-3)/n= 1
y-3= n
y-n-3 =0
y-n-3=0 - - - (1)
For (0,3) co-ordinates, 3-0-3=0 i.e. equation (1) is satisfied.
For (3,6) co-ordinates, 6-3-3=0 i.e. equation (1) is satisfied.
So, y-n-3=0 is the correct equation
