Use Back-Substitution to Solve the System of Linear Equations $$\left\{ \begin{array} { c c c } 4 x - 3 y - 2 z & = & 21 \\6 y - 5 z & = & 5 \\z & = & - 7\end{array} \right.$$

question 23

Multiple Choice

Use back-substitution to solve the system of linear equations.? $$\left\{ \begin{array} { c c c } 4 x - 3 y - 2 z & = & 21 \\6 y - 5 z & = & 5 \\z & = & - 7\end{array} \right.$$ ?

• A)? \(( - 2 , - 5 , - 7 )\)
• B)? \(( - 2,5,7 )\)
• C)? \(( - 5,7 , - 2 )\)
• D)? \(( - 2 , - 5,7 )\)
• E)? \(( - 5 , - 7 , - 2 )\)

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