Prove that A - B is a subset of A

1. A is a subset of A U B
2. A - B is a subset of A

set A = {1,2,3,4}; set B = {3,4,5,6}
intersection {3,4}

prove that A - B is a subset of A, anyone? please?

A-B is the complement. Therefore: What's in A that isn't in B?
set A = {1,2,3,4}; set B = {3,4,5,6}
{1,2,3,4}- {3,4,5,6}= {1,2}

Since {1,2} is also in A={1,2,3,4}, A-B is a subset of A

:)

Very simple. Subtract those elements from set A which are also members of B.
A={1,2,3,4} B={3,4,5,6} so A-B={1,2} which is a subset of A.