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Solve the system of equations. X+y-z=1 3x-y+z=7 x- 4y + 2z = -18 Select the correct choice below and fill in any answer boxes
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aty-z=1 3x -y + z = 7 x - 4y + 2 2 = -18 Gaussian Elimination 1 | 3 Li -1 -4 7 -18 2 I 1 - R2 y R, - 3R, Rz » Rz-R, Lo -5 3 RR₂ R₂ + R3 0 11 12 x =2 4 = !! z = 12

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