Use Matrices to Solve

question 38

Essay

Use matrices to solve: $\left\{ \begin{array} { l } 4 a - 2 b + 6 c - 7 d = - 91 \\9 a + 6 b - 7 c - 5 d = - 28 \\8 a - 5 b + 2 c - 4 d = - 4 \\2 a - 4 b - 2 c + 3 d = 77\end{array} \right.$

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