What value of x1 satisfies the following linear system? (You may use Scilab.)8 = 4x1 + 3x2 + 7x3 +9x47= 2x1 + 2x2 -5x3 -6x44 = 2x1 + 6x2 - 6x3 -7x40 = x1 - x2 -x3 - x4

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What value of x1 satisfies the following linear system? (You may use Scilab.)<br>8 = 4x<sub>1</sub> + 3x<sub>2</sub> + 7x<sub>3</sub> +9x<sub>4</sub><br/>7= 2x<sub>1</sub> + 2x<sub>2</sub> -5x<sub>3</sub> -6x<sub>4</sub><br/>4 = 2x<sub>1</sub> + 6x<sub>2</sub> - 6x<sub>3</sub> -7x<sub>4</sub><br/>0 = x<sub>1</sub> - x<sub>2 </sub>-x<sub>3</sub> - x<sub>4<br></sub>