3. Find the solution to the following system of linear equations using LU decomposition of the coefficient matrix. -2x₁ + x₂-x₂ = 4 x + 2x₂ + 3x₂ = 13 3x₁ + x3 = -1 4. Find the solution to the system of linear equations in Q3 above using QR decomposition of the coefficient matrix.

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