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Sati [7]
3 years ago
5

7x+6y=21 X+3y=-12 what is the answer

Mathematics
1 answer:
katen-ka-za [31]3 years ago
7 0
7x + 6y =  21 ⇒ 7x + 6y =  21
1x + 3y = -12 ⇒ 2x + 6y = -24
                                   5x = 45
                                    5      5
                                      x = 9
                              x + 3y = -12
                              9 + 3y = -12
                            - 9             - 9
                                    3y = -21
                                     3       3
                                      y = -7
                                (x, y) = (9, -7)
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