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Use an Inverse Matrix to Find the Solution to the System

Question 137

Multiple Choice

Use an inverse matrix to find the solution to the system.
- {x1+x3+x4=4x2+x3x4=122x1+2x2+x33x4=234x2+2x4=6\left\{ \begin{aligned}x _ { 1 } + x _ { 3 } + x _ { 4 } & = 4 \\x _ { 2 } + x _ { 3 } - x _ { 4 } & = 12 \\2 x _ { 1 } + 2 x _ { 2 } + x _ { 3 } - 3 x _ { 4 } & = 23 \\4 x _ { 2 } + 2 x _ { 4 } & = 6\end{aligned} \right.


A) x1=1,x2=4,x3=0,x4=1x _ { 1 } = 1 , x _ { 2 } = 4 , x _ { 3 } = 0 , x _ { 4 } = 1
B) no solution
C) x1=2,x2=2,x3=5,x4=6x _ { 1 } = 2 , x _ { 2 } = 2 , x _ { 3 } = - 5 , x _ { 4 } = - 6
D) x1=1,x2=3,x3=6,x4=3x _ { 1 } = 1 , x _ { 2 } = 3 , x _ { 3 } = 6 , x _ { 4 } = - 3

Correct Answer:

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