The following are equivalent in boolean algebra.
1) a+b=b

2) a*b=a

3) a'+b=1

4) a*b'=0

a)Proove the equivalence of (1) and (2).
b)Proove the equivalence of (1) and (3).

2. ## Re: Please help with this Boolean Algebra quiz.

a) $a \subseteq b$ you figure out why from (1) and apply it to show (2)

b) De'Morgan's law. Look it up if you don't know it and apply it to (3) to obtain (4)