Given the matrices AA and BB shown below, find 2, A, plus, one third, B, .2A+ 3 1 ​ B. A, equals, open square bracket, begin matrix row 1, column 1, 6 row 1, column 2, 3 row 1, column 3, 0 end matrix , close square bracket, B, equals, open square bracket, begin matrix row 1, column 1, 9 row 1, column 2, 6 row 1, column 3, minus, 9 end matrix , close square bracket A=[ 6 ​ 3 ​ 0 ​ ]B=[ 9 ​ 6 ​ −9 ​ ]