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Linear System, substitutional method

5x+4y=32
9x-y=33

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Sagot :

Panoyinidn
5x + 4y = 32 ⇒ 45x + 36y = 288
9x -  1y = 33 ⇒ 45x -    5y = 165
                                    41y = 123
                                     41      41
                                        y = 3
                            5x + 4(3) = 32
                              5x + 12 = 32
                                   - 12  - 12
                                      5x = 20
                                       5      5
                                        x = 4
                                  (x, y) = (4, 3)
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