On the augmented matrix A below, perform all three row operations in the order given. ((a) followed by (b) followed by (c)) and then write the resulting augmented matrix
A = [1 3 -1 | 6]
[1 4 -3 |-3]
[-3 -13 -4 | 5]
a. R₂ =-1r₁+r₂
b. R₃=3r₁+r₃
c. R₃=4r₂+r₃