​Solve the System of Linear Equations Using the Inverse Matrix

question 38

Multiple Choice

​Solve the system of linear equations $$\left\{ \begin{array} { l l } 5 x _ { 1 } - 10 x _ { 2 } - 5 x _ { 3 } - 10 x _ { 4 } & = 0 \\15 x _ { 1 } - 25 x _ { 2 } - 10 x _ { 3 } - 15 x _ { 4 } & = 8 \\10 x _ { 1 } - 25 x _ { 2 } - 10 x _ { 3 } - 25 x _ { 4 } & = - 8 \\- 5 x _ { 1 } + 20 x _ { 2 } + 20 x _ { 3 } + 55 x _ { 4 } & = 16\end{array} \right.$$ using the inverse matrix $$\frac { 1 } { 5 } \left[ \begin{array} { c c c c } - 24 & 7 & 1 & - 2 \\- 10 & 3 & 0 & - 1 \\- 29 & 7 & 3 & - 2 \\12 & - 3 & - 1 & 1\end{array} \right]$$ .

• A)​ \[\left[ \begin{array} { l }
• x _ { 1 } \\
• x _ { 2 } \\
• x _ { 3 } \\
• x _ { 4 }
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 16 } { 5 } \\\\
• \frac { 8 } { 5 } \\\\
• \frac { - 8 } { 5 } \\\\
• \frac { - 16 } { 5 }
• \end{array} \right]\]
• B)​ \[\left[ \begin{array} { l }
• x _ { 1 } \\
• x _ { 2 } \\
• x _ { 3 } \\
• x _ { 4 }
• \end{array} \right] = \left[ \begin{array} { c }
• 0 \\\\
• \frac { 8 } { 5 } \\\\
• 0 \\\\
• \frac { 16 } { 5 }
• \end{array} \right]\]
• C)​ \[\left[ \begin{array} { l }
• x _ { 1 } \\
• x _ { 2 } \\
• x _ { 3 } \\
• x _ { 4 }
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 16 } { 5 } \\\\
• \frac { 8 } { 5 } \\\\
• 0 \\\\
• 0
• \end{array} \right]\]
• D)​ \[\left[ \begin{array} { l }
• x _ { 1 } \\
• x _ { 2 } \\
• x _ { 3 } \\
• x _ { 4 }
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 24 } { 5 } \\\\
• \frac { - 8 } { 5 } \\\\
• 0 \\\\
• \frac { - 16 } { 5 }
• \end{array} \right]\]
• E)​ \[\left[ \begin{array} { l }
• x _ { 1 } \\
• x _ { 2 } \\
• x _ { 3 } \\
• x _ { 4 }
• \end{array} \right] = \left[ \begin{array} { c }
• \frac { 24 } { 5 } \\\\
• \frac { - 8 } { 5 } \\\\
• \frac { - 16 } { 5 } \\\\
• \frac { 16 } { 5 }
• \end{array} \right]\]

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