mayvar1 mayvar1

24-03-2015
Mathematics

contestada

Solve.
x^2+y^2=9
2z^2-y^2=6

Respuesta :

Panoyin Panoyin

25-03-2015

1x² + 1y² = 9
2x² - 1y² = 6
   3x² = 15
      3     3
   x² = 5
   x ≈ 2.236
2(2.236)² - 1y² = 6
2(5) - 1y² = 6
10 - 1y² = 6
-10 -10
   -1y² = -4
   -1    -1
      y² = 4
   y = 2
   (x, y) = (2.236,2)
(x², y²) = (5, 4)
x² + y² = 9

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