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# Lab2 - Exercise 1 a B=[2-1 4-5 27-1 3-2-1-26 0 1 5-6 15 3-8...

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Exercise 1 a) B=[2 -1 4 -5 27; -1 3 -2 -1 -26; 0 1 5 -6 15; 3 -8 1 0 53] B = 2 -1 4 -5 27 -1 3 -2 -1 -26 0 1 5 -6 15 3 -8 1 0 53 b) B([1 2],:)=B([2 1],:) Switches positions of row 1 and 2 B(2,:)=B(2,:)+2*B(1,:) Multiplies row 1 by 2 and adds to row 2 B(4,:)=B(4,:)+3*B(1,:) Multiplies row 1 by 3 and adds to row 4 B([2 4],:)=B([4 2],:) Switches position of row 2 and 4 B(3,:)=B(3,:)+B(4,:) Adds row 3 to row 4 B(3,:)=B(3,:)-B(2,:) Subtracts row 2 from row 3 B(4,:)=B(4,:)-5*B(2,:) Multiplies row 2 by 5 and subtracts from row 4 B(3,:)=B(3,:)/10 Divides row 3 by 10 B(4,:)=B(4,:)-25*B(3,:) Multiplies row 3 by 25 and subtracts from row 4 B = -1 3 -2 -1 -26 0 1 -5 -3 -25 0 0 1 -3/10 4 0 0 0 31/2 0 c)x 1 =3; x 2 =-5, x 3 =4, x 4 =0 Exercise 2 a) A=[-2 1 9 1; 3 3 -4 2; 1 4 5 5] A = -2 1 9 1 3 3 -4 2 1 4 5 5 b) A([1 3],:)=A([3 1],:) Switches positions of row 1 and 3 A(2,:)=A(2,:)-3*A(1,:) Multiplies row 1 by 3 and subtracts from row 2 A(3,:)=A(3,:)+2*A(1,:) Multiplies row 1 by 2 and subtracts from row 3 A(2,:)=A(2,:)/-9 Divides row 2 by 9 A(3,:)=A(3,:)-9*A(2,:) Multiplies row 2 by 9 and subtracts from row 1 A = 1 4 5 5 0 1 19/9 13/9 0 0 0 -2

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c) This matrix is inconsistent because there are no solutions as given by the reduced matrix. Exercise 3
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