Use the​ Gauss-Jordan method to solve the following system of equations. 7x minus 4y plus 4z equals 6 7x plus 3y minus nothingz equals 11 21x minus 5y plus 7z equals 23 Question content area bottom Part 1 Write the augmented matrix for the corresponding system of equations. Select the correct choice below and fill the answer boxes to complete your choice. A.left bracket Start 3 By 3 Matrix 1st Row 1st Column nothing 2nd Column nothing 3rd Column nothing 2nd Row 1st Column nothing 2nd Column nothing 3rd Column nothing 3rd Row 1st Column nothing 2nd Column nothing 3rd Column nothing EndMatrix right bracket left bracket Start 3 By 3 Matrix 1st Row 1st Column nothing 2nd Column nothing 3rd Column nothing 2nd Row 1st Column nothing 2nd Column nothing 3rd Column nothing 3rd Row 1st Column nothing 2nd Column nothing 3rd Column nothing EndMatrix right bracket                           

B.left bracket Start 3 By 4 Table 1st Row 1st Column nothing 2nd Column nothing 3rd Column nothing 4st Column nothing 2nd Row 1st Column nothing 2nd Column nothing 3rd Column nothing 4st Column nothing 3rd Row 1st Column nothing 2nd Column nothing 3rd Column nothing 4st Column nothing EndTable right bracket left bracket Start 3 By 4 Table 1st Row 1st Column nothing 2nd Column nothing 3rd Column nothing 4st Column nothing 2nd Row 1st Column nothing 2nd Column nothing 3rd Column nothing 4st Column nothing 3rd Row 1st Column nothing 2nd Column nothing 3rd Column nothing 4st Column nothing EndTable right bracket                                    

C.left bracket Start 4 By 2 Matrix 1st Row 1st Column nothing 2nd Column nothing 2nd Row 1st Column nothing 2nd Column nothing 3rd Row 1st Column nothing 2nd Column nothing 4st Row 1st Column nothing 2nd Column nothing EndMatrix vertical line Start 4 By 1 Matrix 1st Row 1st Column nothing 2nd Row 1st Column nothing 3rd Row 1st Column nothing 4st Row 1st Column nothing EndMatrix right bracket left bracket Start 4 By 2 Matrix 1st Row 1st Column nothing 2nd Column nothing 2nd Row 1st Column nothing 2nd Column nothing 3rd Row 1st Column nothing 2nd Column nothing 4st Row 1st Column nothing 2nd Column nothing EndMatrix vertical line Start 4 By 1 Matrix 1st Row 1st Column nothing 2nd Row 1st Column nothing 3rd Row 1st Column nothing 4st Row 1st Column nothing EndMatrix right bracket                        

           

D.left bracket Start 4 By 2 Matrix 1st Row 1st Column nothing 2nd Column nothing 2nd Row 1st Column nothing 2nd Column nothing 3rd Row 1st Column nothing 2nd Column nothing 4st Row 1st Column nothing 2nd Column nothing EndMatrix right bracket left bracket Start 4 By 2 Matrix 1st Row 1st Column nothing 2nd Column nothing 2nd Row 1st Column nothing 2nd Column nothing 3rd Row 1st Column nothing 2nd Column nothing 4st Row 1st Column nothing 2nd Column nothing EndMatrix right bracket