Determine Whether the Two Systems of Linear Equations Yield the Same

Multiple Choice

Determine whether the two systems of linear equations yield the same solutions.If so,find the solutions using matrices. $$\left\{ \begin{aligned}x + 2 y - 4 z & = - 8 \\y - 7 z & = 4 \\z & = - 1\end{aligned} \right.$$ $$\left\{ \begin{aligned}x - y - 5 z & = 21 \\y - 6 z & = 3 \\z & = - 1\end{aligned} \right.$$

A) x = 6,y = 3,z = -1
B) x = -6,y = -3,z = -1
C) x = 3,y = -1,z = -6
D) The systems yield different solutions.
E) x = -3,y = -1,z = -6