I think TA's solution #3.b is wrong.

I think the graph of x[n-k] is wrong.

X-axis should represent n+1, n+2, n+3, ...., n+10.

So, the answer should be


y[n]=0 , n<-10
y[n]=n+11, -10=<n<-1
y[n]=9-n, -1=<n=<8
y[n]=0, 8<n


TA Comments: Kim's solution is the right one. The solutions will be updated.

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Abstract algebra continues the conceptual developments of linear algebra, on an even grander scale.

Dr. Paul Garrett