Question: use MATLAB Matrix A = [3, 1, 4; 2, 6, 7 ]. 1. Code (only one line of code) to replace the matrix elements :

use MATLAB Matrix A = [3, 1, 4; 2, 6, 7 ].
1. Code (only one line of code) to replace the matrix elements : 2, 7 by 5, 8. \\
2. Code (only one line of code) to ADD 5, 8, 9 as the 2nd row. 
3. Code (only one line of code) to ADD 5, 8 as the 2nd column. 
4. Code (only one line of code) to remove elements: 1, 6.

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