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Likurg_2 [28]
3 years ago
11

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

Mathematics
1 answer:
Doss [256]3 years ago
5 0
 5x + 2y = 21 ⇒ 5x + 2y = 21
-1x - 1y = -9  ⇒ <u>5x + 5y = 45</u>
                                 <u>-3y</u> = <u>-24</u>
                                  -3      -3
                                    y = 8
                        5x + 2(8) = 21
                          5x + 16 = 21
                         <u>      - 16  - 16</u>
                                  <u>5x</u> = <u>5</u>
                                   5     5
                                    x = 1
                              (x, y) = (1, 8)
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