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Algebra

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Find the exact solutions of the systems of equation x^2+2y^2=18 and x=2y

  • Algebra - ,

    (2y)^2 + 2 y^2 = 18
    4 y^2 + 2 y^2 = 18
    6 y^2 = 18
    y^2 = 3
    y = +sqrt 3 or -sqrt 3
    x^2 + 2 *3 = 18
    x^2 = 12
    x = + or - 2 sqrt 3

  • Algebra - ,

    20=+or-2 sqrt 3=5

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