Solve this system that is represented by the following matrix.

[1 -2 -2| -3
0 5 3| 13
0 0 1| 1]

Write answer in (x, y, z)

Your result is already in the final stage before you can just start stating the answer.

from the last line, z = 1
in the 2nd line 5y+3z = 13
plug in z = 1, then find y

now you have y and z
so plug those into the 1st line and you are done