Write the system of equations corresponding to the augmented matrix. Then perform the row operationsUpper R 1 equals negative 2 r 2 plus r 1 and Upper R 3 equals 2 r 2 plus r 3 on the given augmented matrix. left bracket Start 3 By 4 Table 1st Row 1st Column 7 2nd Column negative 7 3rd Column 1 4st Column negative 5 2nd Row 1st Column 3 2nd Column negative 2 3rd Column 8 4st Column negative 5 3rd Row 1st Column negative 6 2nd Column 1 3rd Column 5 4st Column 3 EndTable right bracket Question content area bottom Perform the row operations Upper R 1 equals negative 2 r 2 plus r 1 and Upper R 3 equals 2 r 2 plus r 3 on the original matrix given in the problem statement, and enter the resulting matrix below