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5x+2y=21-x-y=-9 what is the answer

Sagot :

Panoyin
 5x + 2y = 21 ⇒ 5x + 2y = 21
-1x - 1y = -9  ⇒ 5x + 5y = 45
                                 -3y = -24
                                  -3      -3
                                    y = 8
                        5x + 2(8) = 21
                          5x + 16 = 21
                               - 16  - 16
                                  5x = 5
                                   5     5
                                    x = 1
                              (x, y) = (1, 8)
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