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Math Help - Solve for y

  1. #1
    is up to his old tricks again! Jhevon's Avatar
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    Solve for y

    Hey guys, I have two weird equations that I want to solve for y, but i can't really figure out how to separate the y's from the x's. Here they are:

    x^2 -xy + y^2 = 7

    3x^2 + xy - x - 2y^2 = 2

    Thanks
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Jhevon View Post
    Hey guys, I have two weird equations that I want to solve for y, but i can't really figure out how to separate the y's from the x's. Here they are:

    x^2 -xy + y^2 = 7

    Rearrange:

    y^2 - xy +(x^2-7) = 0.

    Threat as a quadratic in y, then the quadratic formula tell us that:

    y= [x +/- sqrt(x^2-4(x^2-7))]/2

    The same method can be used on the other question

    RonL
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Thanks man, i got it
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