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​Solve the System of Linear Equations Using the Inverse Matrix

Question 38

Multiple Choice

​Solve the system of linear equations {5x1−10x2−5x3−10x4=015x1−25x2−10x3−15x4=810x1−25x2−10x3−25x4=−8−5x1+20x2+20x3+55x4=16\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 15[−2471−2−1030−1−2973−212−3−11]\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) ​ [x1x2x3x4]=[16585−85−165]\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) ​ [x1x2x3x4]=[0850165]\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) ​ [x1x2x3x4]=[1658500]\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) ​ [x1x2x3x4]=[245−850−165]\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) ​ [x1x2x3x4]=[245−85−165165]\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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