Let R be a relation in N defined by R={(x, y): X+2y=8}. The range of R is 

(2)  R= {(x, y):x+2y=8, x, y$\in$N }

                       X+2y=8

          $\Rightarrow$     y=$\frac{8-x}{2}$

          R= {(2,3),(4,2),(6,1)}

       Range of R = { y: (x, y)$\in$ R} ={1,2,3}