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Math Help - Solve for the system

  1. #1
    Junior Member
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    Solve for the system

    x^2 + y^2 = 9,
    y = x^2 + 4

    I don't know, but do you just substitute in y and solve?

    Thanks for the help!^^
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  2. #2
    Super Member
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    Put x^2 = y - 4 in the first equation and solve the quadratics for y.
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  3. #3
    Junior Member
    Joined
    Sep 2009
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    oops. my mistake. the equations were:

    <br /> <br />
x^2 + y^2 = 9,<br />
    <br /> <br />
y = 2x -3<br />
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  4. #4
    Newbie
    Joined
    May 2010
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    Square the second equation to get: (2x-3)^2. Substitute that into the first equation. Solve for x. Plug the value you found for x back into equation 2, that gives you y.
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