Answer: All the subsets of the given set are { }, {-1}, {9} and {1, 9}.
Step-by-step explanation: We are given to write all the subsets of the following set :
S = {-1, 9}.
We know that
a subset of a set is a set whose elements are present in the given set.
So, the subsets of the given set are {-1}, {9}, {-1, 9} and { }.
Thus, all the subsets of the given set are { }, {-1}, {9} and {1, 9}.
