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Question: problem 7 if a square matrix a is singular is...

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Problem 7. If a square matrix A is singular, is it also true that its transpose AT is singular? What about the matrix products AA and (ATA)T? Problem 8. Is the system of linear equations shown below dependent or independent? Determine its solution set. -7y + 5z - w = 2 ,4x-9y + 11z + w = 6
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