i am having a bit(actually alot) of problems with set algebra

here are some examples

using laws of set algebra show that generally

(x\y) u (x n y) = x

heres another one

(y'\x) 'u (x \ y) = x u y

can you please explain in detail (i am clueless bout these questions)

how you solved them, the explanation is more important than the answer, i have a test soon so a quick replay would be helpfull