Use Cramerʹs Rule to Solve the System of Equations $$\begin{array} { l } 2 x + 4 y + 8 z = 40 \\x + 2 y + 4 z = - 10 \\x + y + z = - 4\end{array}$$

Use Cramerʹs rule to solve the system of equations. If D = 0, use another method to determine the solution set.
- $$\begin{array} { l } 2 x + 4 y + 8 z = 40 \\x + 2 y + 4 z = - 10 \\x + y + z = - 4\end{array}$$

A) Cramer's rule does not apply since $D = 0$ ; $\varnothing$
B) Cramer's rule does not apply since $D = 0 ; \{ ( 2 z - 1 , z + 2 , z ) \}$
C) $\{ ( - 5,3 , - 4 ) \}$
D) $\{ ( - 4 , - 5,3 ) \}$

Correct Answer:

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