3- Using echelon form solve the following linear system o equations (c) 3x₁ + 6x₂ x₁ + 3x₂x₂ - 4x4 = x₁ - x₂ + x3 + 2x4 = 2x₁ + 3x₂ = - - 3x4= 3 (e) x₁ + (d) x₁ + 2x₂ + 2x3 + 5x4 = 11 2x₁ + 4x₂ + 2x3 + 8x4 = 14 x₁ + 3x₂ + 4x3 + 8x4 = 19 x₁ - x₂ + x3 x₂ + 2x3 + 2x₁ + 3x₂ + 6x3 + 3x₂ + 4x3 + X₂ X₂ - X₁ -12 8 8 6x4 = 19x4 15x4 = 6x₁ = = 2 11 36 28 -12

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