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5. Solve the following system of equations by Gauss-elimination method: (a) 9x+3y+4x=7 4x+3y+4z = 8 (b) x+2y+3x+2w = -1 -x-2y-2z+w = 2 x+y+z =

5. Solve the following system of equations by Gauss-elimination method: (a) 9x+3y+4x=7 4x+3y+4z = 8 (b) x+2y+3x+2w = -1 -x-2y-2z+w = 2 x+y+z = 3 2x+4y+8z+12w = 4 6. Find the rank of the matrix A using definition where [1 0 3 [2 3 1 11 (i) A = 4-15 (ii) A = 3 0 4 2 2 0 6 6 9-3 3

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