Linearity and Time Invariance
Given system: Input Output X0[n]=δ[n] -> Y0[n]=δ[n-1] X1[n]=δ[n-1] -> Y1[n]=4δ[n-2] X2[n]=δ[n-2] -> Y2[n]=9 δ[n-3] X3[n]=δ[n-3] -> Y3[n]=16 δ[n-4] ... ... Xk[n]=δ[n-k] -> Yk[n]=(k+1)2 δ[n-(k+1)] -> For any non-negative integer k
