Question: Let A be a given matrix and b a given vector. Show that there exists a vector x such that Ax b and x

Let A be a given matrix and b a given vector. Show

Let A be a given matrix and b a given vector. Show that there exists a vector x such that Ax b and x 0 if and only if for any vector y satisfying ATy 0 and y 0, we have by 0.

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