Question 89000
A.


Here is the elimination method:
*[invoke solving_linear_system_by_elimination 4, -1, 6, 1, -1, 0]

------------------------------------------------

Here is the substitution method:
*[invoke solving_linear_system_by_substitution 4, -1, 6, 1, -1, 0]


===============================================


B.



Here is the elimination method:
*[invoke solving_linear_system_by_elimination 5, 2, 1, 1, -3, 7]

------------------------------------------------

Here is the substitution method:
*[invoke solving_linear_system_by_substitution 5, 2, 1, 1, -3, 7]