Solve by using matrices. If no solution, write inconsistent. (Just trying to double check my work, don't need anyone to show their work)

{1 1 1 2
2 -1 -1 -5
1 2 2 5}

Question

Solve by using matrices. If no solution, write inconsistent. (Just trying to double check my work, don't need anyone to show their work)

{1  1   1   2
 2 -1 -1 -5
 1   2   2  5}

anonymous · Answer

Assuming the matrix represents a system of linear equations:
$$x_{1}=x _{4}$$
$$x _{2}=-x _{3}-3x _{4}$$

anonymous · Answer

Do you know what x, y, and z equal? It looks like z is arbitrary. And yes, it is system of linear equations.

anonymous · Answer

wait, does this represent x+y+z=2, or x+y+z+2a=0?

anonymous · Answer

x+y+z=2

anonymous · Answer

oh, forget about my first anser then.

anonymous · Answer

x=-1, y+z=3

anonymous · Answer

Awesome! That's what I got too. Thanks