9. In each part, determine whether the given 3-tuple is a solution of the linear system (a) (3, 1, 1) 2x1 - 4x₂ X3 = 1 x3 = 1 - = 1 X₁ - 3x₂ + X1 3x₁5x₂ 3x3 : (b) (3,-1, 1) (c) (13, 5, 2)

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