Question

2x + y + 6z = + 1
3x + 2y + 5z = 16
7x + 3y - 4z = 11

Answer 1

1) x=1/2-y/2-3z

2)x= 16/3- 2y/3- 5z/3

3)x= 11/7- 3y/7+ 4z/7

Explanation:

isolate the variable, to do that divide each side by the factors that don't contain the variable