Posted by **jen** on Monday, August 4, 2008 at 1:42am.

Let A be a 5 by 4 matris and suppose that the system Ax=b has a solution. Explain why the solution is unique if and only if the rank of A is 4.

I said that it is unique becaue the rank is equal to the number of columns.

Do you have a better explaination.

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