Need with elementary row operations!
1. [(1,,-13): }|{: (1,,1)]-1/13r_2rarrr_2rarr
2. [(1,,2): }|{: (1,,1)]r_2+(-5r_1)rarrr_2rarr
next question, determine if the matrices are inverses of each other by multiplying the matrices.
1. a=[(0,,4)]
and b=[(-2,1/,0)]
2. x=[(4,,2)]
and y=[(1/4,/8,1/2)]