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Apr 20th, 2018
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  1. (1) 2x+2y=40
  2. (2) xy=91
  3.  
  4. (2):
  5. xy=91
  6. x=91/y
  7. Indsæt i (1).
  8.  
  9. (1):
  10. 2x+2y=40
  11. 2*(91/y)+2y=40
  12. 182/y+2y=40
  13. 1-
  14. 82+2y^2=40y
  15. 91+y^2=20y
  16. 91=20y-y^2
  17. y=13 og y=7
  18. Indsæt i (2)
  19.  
  20. (2):
  21. x=91/y
  22. x=7 og x=13
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