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Pepsi [2]
3 years ago
9

3x+3y+6z=9 2x+y+3z=7 x+2y-z=-10 any one know the answer

Mathematics
1 answer:
kati45 [8]3 years ago
7 0
3x + 3y + 6z = 9
2x + 1y + 3z = 7    ⇒ 6x + 6y + 8z = 6
1x + 2y  - 1z = -10                                   6x + 6y + 8z = 6
                                                                                4z = 12 
3x + 3y + 6z = 9                                                       4      4
2x + 1y + 3z = 7    ⇒  0x + 0y + 4z = 12                    z = 3
1x + 2y  - 1z = -10                                             2x + y = -2
                                                                      2x + (-4) = -2
                                                                          2x - 4 = -2
                                                                              + 4  + 4
                                                                               2x = 2
                                                                                2     2
                                                                                 x = 1
                                                                       (x, y, z) = (1, -4, 3)
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