(a) Using Cramer's rule, find x₁, given the following system of equations: 5x1 + x2-x3 = 4 = 1 = 2 9x1 x2 x3 x1 - x2+5x3 (b) Using the adjoint formula for the inverse, find the (1,2) entry of A-1 for the matrix 1 A = 9 1 -1 -1 5 [Note: Your work in part (a) might be helpful.]

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