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

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27-03-2015
Mathematics

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

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Panoyin Panoyin · Answer 1 · 2015-04-04T17:31:44+02:00

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)