annthompson2 annthompson2
  • 19-09-2017
  • Mathematics
contestada

x2+xy=20, y2+xy=30, Solve for xy.

Respuesta :

stallworth16 stallworth16
  • 23-09-2017
If you substitute 2 for x, and 3 for y, than that gives you half the value of the real answer. So 2×3 =6, what is 6 half of? 12
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