Question

Matrices: What did I do wrongggg?!

Answer 1

I got right solutions but not the right ones they wanted... I followed the instructions step by step too...

Answer 2

mistake is in
-4R2 + R3

Answer 3

when you multiply -4R2 you get
[ 0 -4 4 8 ]
then adding to R3
[ 0 4 - 3 -3 ]
--------------------
[ 0 0 1 5 ]

Answer 4

you have [0 0 1 13]
which messes up z and the other solutions

Answer 5

¿Necesitas ayuda?

Answer 6

Omg thank you @jayzdd

Answer 7

Wait @jayzdd 1x-4=-4 + 4 is 0?...