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substituition method

5x-3y+1=16
2x+5y=-6

Sagot :

Panoyin
5x - 3y + 1 = 16 ⇒ 10x -    6y + 2 = 16
2x + 5y + 0 = -6 ⇒ 10x + 25y + 0 = -6
                                         31y + 2 = 10
                                                  -2    -2
                                               31y = 8
                                                31    31
                                                   y = 8/31
                            5x - 3(8/31) + 1 = 16
                              5x - 24/31 + 1 = 16
                                     5x + 7/31 = 16
                                            -7/31    -7/31
                                                 5x = 10 24/31
                                                  5           5
                                                   x = 2 24/155
                                             (x, y) = (2 24/155, 8/31)
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