Question

Ayuda por favor! Es urgente

Answer 1

$x + y - z = 5 \\ x + 2y + z = 12 \\ - x + y + z = 1 \\ \\ x + y - z = 5 \\ x + 2y + z = 12 \\ \\ x + y - z = 5 \\ - x + y + z = 1 \\ \\ 2x + 3y = 17 \\ y = 3 \\ \\ 2x + 3y = 17 \\ y = 3 \\ \\ x = 4 \\ y = 3 \\ \\ 4 + 3 - z = 5 \\ \\ z = 2 \\ \\ (x,y,z) = (4,3,2) \\ \\ 4 + 3 - 2 = 5 \\ 4 + 2 \times 3 + 2 = 12 \\ - 4 + 3 + 2 = 1 \\ \\ 5 = 5 \\ 12 = 12 \\ 1 = 1 \\ \\ (x,y,z) = (4,3,2) \\ \\ - - - - - - - - - - - - - - - - \\ \\ 3x + 2y - z = 20 \\ 3x + y + z = 28 \\ 3x - y + z = 18 \\ \\ 3x + 2x - z = 20 \\ 3x + y + z = 28 \\ \\ 3x + 2y - z = 20 \\ 3x - y + = 16 \\ \\ 6x + 3y = 48 \\ 6x + y = 36 \\ \\ 6x + 3y = 48 \\ 6x + y = 36 \\ \\ x = 5 \\ y = 6 \\ \\ 3 \times 5 + 2 \times 6 - z = 20 \\ \\ z = 7 \\ \\ (x,y,z) = (5,6,7) \\ \\ 3 \times 5 + 2 \times 6 - 7 = 20 \\ 3 \times 5 + 6 + 7 = 28 \\ 3 \times 5 - 6 + 7 = 16 \\ \\ 20 = 20 \\ 28 = 28 \\ 16 = 16 \\ \\ (x,y,z) = (5,6,7) \\ \\ - - - - - - - - - - - - - - - - \\ \\ 2x + y - z = 7 \\ 3x + 2y + z = 14 \\ - 3x - 2y + z = - 12 \\ \\ 2x + y - z = 7 \\ 3x + 2y + z = 14 \\ \\ 2x + y - z = 7 \\ 3x - 2y + z = - 12 \\ \\ 5x + 3y = 21 \\ - x - y = - 5 \\ \\ x = 3 \\ y = 2 \\ \\ 2 \times 3 + 2 - z = 7 \\ \\ z = 1 \\ \\ (x,y,z) = (3,2,1) \\ \\ 2 \times 3 + 2 - 1 = 7 \\ 3 \times 3 + 2 \times 2 + 1 = 14 \\ - 3 \times 3 - 2 \times 2 + 1 = - 12 \\ \\ 7 = 7 \\ 14 = 14 \\ - 12 = - 12 \\ \\ (x,y,z) = (3,2,1)$