Use Cramerʹs Rule to Solve the System of Equations $$\begin{array} { r } x + y + z = - 1 \\x - y + 3 z = 7 \\3 x + y + z = - 3\end{array}$$

question 437

Multiple Choice

Use Cramerʹs rule to solve the system of equations. If D = 0, use another method to determine the solution set.
- $$\begin{array} { r } x + y + z = - 1 \\x - y + 3 z = 7 \\3 x + y + z = - 3\end{array}$$

• A) \(\{ ( 2 , - 2 , - 1 ) \}\)
• B) Cramer's rule does not apply since \(\mathrm { D } = 0\); \(\varnothing\)
• C) \(\{ ( - 1 , - 2,2 ) \}\)
• D) \(\{ ( 2 , - 1 , - 2 ) \}\)

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