Let S = {0,1,2,3,4} Let R be the binary relation on S such that aRb if and only if a+b=3 and a ≤ 3.

(a) Write this relation down as a subset of the Cartesian product S x S.

Hmm so it reads {a,b} ∈ R

so by substitution we say with a sub set

do we say only{0,3} and {1,2} can be a subset of aRb

eg:- {0,3}{1,2} ⊆ S ?

any help would be good thanks