Use back substitution to solve each of the following systems of equations and write out the coefficient matrix for each of the systems: (a) x13x2 = 2 2x2 = 6 (၁) x1 + 2x2 + 2x3 + x4 = 5 3x2 + x3 — 2x4 = 1 - -x3 + 2x4 = - 1 4x4 = 4

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