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(Solved): #8 In Exercises 7-10, the augmented matrix of a linear system has been reduced by row operations to ...
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In Exercises 7-10, the augmented matrix of a linear system has been reduced by row operations to the form shown. In each case, continue the appropriate row operations and describe the solution set of the original system. 7. \( \left[\begin{array}{rrrr}1 & 7 & 3 & -4 \\ 0 & 1 & -1 & 3 \\ 0 & 0 & 0 & 1 \\ 0 & 0 & 1 & -2\end{array}\right] \) \( \left[\begin{array}{rrrr}1 & 1 & 2 & 0 \\ 0 & 1 & 7 & 0 \\ 0 & 0 & 2 & -2\end{array}\right] \)