We were given the above systems and we were asked to tell whether they are linear (or not) and time invariant(or not).
$y(m,n)=x(m,n) + y(m-a,n-b)$
Although I know the theory for the signal to be linear and time invariant I have trouble applying it. Can any of you explain one of the above so I can continue on my own for the rest of them? Thank you in advance