thanks The coefficient matrix (the augmented matrix without its last column) tor

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The coefficient matrix (the augmented matrix without its last column) tor the system in Exercise 5a is the matrix .A below. Note that A3= A1 + 2A2. where Ai are the rows of A. On the other hand, the consistency condition for this system is equivalent to c=a + 2b, which is essentially the same equation. Explain this "coincidence." [Hint: Compute the sum of the first and twice the second equations in the system in Exercise 5a.] Check that there is a similar relationship between the rows of the coefficient matrices and the consistent conditions for the systems in Exercises 5b and 5c.

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what is question 5?

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