Question

Write the inverse of R i.e. R -1 if R is defined by R = {(x,y) : x,y ∈ N, x+2y = 18}.​

Answer 1

Answer:

x+2y=8 , Given x,y are natural numbers , which implies x,y>0

If y=1 , we get x=6

If y=2 , we get x=4

If y=3 , we get x=2

For y≥4 , x wont be a natural number

So the range of R is {1,2,3}