MatLab questions

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Which are the the correct steps of Gaussian Elimination? Step 1: Forward Elimination Step 2: Backwards Substitution Step 1: Forward Elimination Step 2: Backwards Substitution Step 3: Forwards Substitution Step 1: Forward Elimination Step 2: Forward Substitution Step 3: Backwards Substitution Step 1: Backwards Elimination Step 2: Forward Substitution Which are the correct steps of LU Decomposition? Step 1: Forward Elimination Step 2: Backwards Substitution Step 3: Forwards Substitution Step 1: Forward Elimination Step 2: Backwards Substitution Step 1: Backwards Elimination Step 2: Forwards Substitution Step 1: Forward Elimination Step 2: Forward Substitution Step 3: Backwards Substitution Which of the following has created the correct matrices from the following system of equations: 15*x_1 - 4*x_2 - 7*x_3=5 x_1 - 5*x_2 + 4*x_3=12 4*x_1 + x2-x_3= -3 -7161) [15 1 4 -4 -5 1 -71 (X1 4 -1) (x3) {X2 5 12 -3 [15 -4 1 -5 4 1 -71 4 5 12 (X1) = {X2 ) (x3) -11-3) 716* O [15 1 4 -4 -5 1 -7 4 |{X1 X2 X3} = {5 12 -3} -1 o 4161 [15 1 -4 -5 7 4 157 1 X2}= (X3 5 12 -3 Which of the following is a system of linear equations O 6*x_1 + 4*x_2 - 4*x_3=45 -X_1 + exp(x_2) +6*x_3=2 -3*x_1 - 4*x_2 - x_3 = -36*x_4 O 6*x_1^2+4*x_2 - 4*x_3=45 -x_1 + x_2 +6*x_3^2-2 -3*x_1 - 4*x_2 - x_3 = x_4 O 6*x_1 + 4*x_2 - 4*x_3=45 -x_1 +x_2 +6*x_3=2 -3*x_1 - 4*x_2 - x_3 = -36 cos(x_1) + 4*x_2 - 4*x_3=45 -x_1 +x_2 +6*x_3=2 -3*x_1 - 4*x_2 - sin(x-3) = -36