Lineare Gleichungssysteme mit 3 Unbekannten (8. Klasse)

Löse die folgenden Gleichungssysteme mit einem Verfahren deiner Wahl:

1. $$\begin{array}[t]{rcrcrcrcr}-5\,x & \hspace{-0.7em} + & \hspace{-0.7em} 5\,y & \hspace{-0.7em} + & \hspace{-0.7em} 3\,z & \hspace{-0.7em} = & \hspace{-0.7em} -16\\ -\,x & \hspace{-0.7em} + & \hspace{-0.7em} 3\,y & \hspace{-0.7em} - & \hspace{-0.7em} 3\,z & \hspace{-0.7em} = & \hspace{-0.7em} 0\\ -6\,x & \hspace{-0.7em} - & \hspace{-0.7em} 3\,y & \hspace{-0.7em} - & \hspace{-0.7em} 2\,z & \hspace{-0.7em} = & \hspace{-0.7em} 10\end{array}$$
2. $$\begin{array}[t]{rcrcrcrcr}-6\,x & \hspace{-0.7em} - & \hspace{-0.7em} 5\,y & \hspace{-0.7em} - & \hspace{-0.7em} 5\,z & \hspace{-0.7em} = & \hspace{-0.7em} -8\\ 7\,x & \hspace{-0.7em} + & \hspace{-0.7em} 4\,y & \hspace{-0.7em}- & \hspace{-0.7em} \,\,z & \hspace{-0.7em} = & \hspace{-0.7em} -13\\ -2\,x & \hspace{-0.7em}- & \hspace{-0.7em} \,\,y & \hspace{-0.7em} - & \hspace{-0.7em} 3\,z & \hspace{-0.7em} = & \hspace{-0.7em} -6\end{array}$$
3. $$\begin{array}[t]{rcrcrcrcr}-5\,x & \hspace{-0.7em} + & \hspace{-0.7em} 4\,y & \hspace{-0.7em} - & \hspace{-0.7em} 5\,z & \hspace{-0.7em} = & \hspace{-0.7em} 17\\ 2\,x & \hspace{-0.7em} + & \hspace{-0.7em} 6\,y & \hspace{-0.7em} - & \hspace{-0.7em} 2\,z & \hspace{-0.7em} = & \hspace{-0.7em} -48\\ 7\,x & \hspace{-0.7em} + & \hspace{-0.7em} 2\,y& \hspace{-0.7em} & \hspace{-0.7em} & \hspace{-0.7em} = & \hspace{-0.7em} -56\end{array}$$
4. $$\begin{array}[t]{rcrcrcrcr}7\,x & \hspace{-0.7em} - & \hspace{-0.7em} 5\,y & \hspace{-0.7em} - & \hspace{-0.7em} 5\,z & \hspace{-0.7em} = & \hspace{-0.7em} 31\\ -6\,x & \hspace{-0.7em} - & \hspace{-0.7em} 5\,y & \hspace{-0.7em} - & \hspace{-0.7em} 7\,z & \hspace{-0.7em} = & \hspace{-0.7em} -14\\ 2\,x & \hspace{-0.7em} + & \hspace{-0.7em} 5\,y & \hspace{-0.7em} - & \hspace{-0.7em} 4\,z & \hspace{-0.7em} = & \hspace{-0.7em} -31\end{array}$$