Let a be as above, consider ax = b where b = (31, 2, 21, 11). find x1 using cramer’s rule. (you may use matlab/octave to compute the determinants, but write out what you are
matrix a= 8 6 -3 20
4 2 -5 -7
8 2 7 20
4 2 -11 -4

Step-by-step explanation:

The matrix of the system of equations is .

Remember that using Cramer's Rule , where is the same matrix A change the first column of A by b. Then .

Using Octave we calculate the determinants and obtain that det(A)=-3840 and  .

Then

2

step-by-step explanation:

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