Coolean algebra. so confused!?

how do i use axioms and theorems to show (X+Y)(X'+Y)=Y? please tell me if im completely wrong!.. so LHS XX'+YY+XY+X'Y =XX'+YY+Y(X+X') =XX'+YY+Y.1 =XX'+YY+Y =0+YY+Y =0+Y+Y =y =RHS is this right?? also how do i use demorgan's laws to find the complement of... show more how do i use axioms and theorems to show (X+Y)(X'+Y)=Y?

please tell me if im completely wrong!..
so LHS XX'+YY+XY+X'Y
=XX'+YY+Y(X+X')
=XX'+YY+Y.1
=XX'+YY+Y
=0+YY+Y
=0+Y+Y
=y
=RHS
is this right??

also how do i use demorgan's laws to find the complement of XYZ'+W(Z+Y')?

thanks
2 answers 2