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9 April, 12:57

Solve.

x^2+y^2=9

2z^2-y^2=6

+3
Answers (1)
  1. 9 April, 13:22
    0
    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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