###### Exercise 2

Suppose that \(A\) is a \(135\times2201\) matrix. If \(A\xvec\) is defined, what is the dimension of \(\xvec\text{?}\) What is the dimension of \(A\xvec\text{?}\)

Suppose that \(A\) is a \(135\times2201\) matrix. If \(A\xvec\) is defined, what is the dimension of \(\xvec\text{?}\) What is the dimension of \(A\xvec\text{?}\)