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Math Help - simultaneous equations

  1. #1
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    simultaneous equations

    hi i've got the question: solve the simultaneous equations 2x + y = 9 and (x - 2)^2 + y^2 = 5

    can someone show me how this would be done please? thanks
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  2. #2
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    Quote Originally Posted by mark View Post
    hi i've got the question: solve the simultaneous equations 2x + y = 9 and (x - 2)^2 + y^2 = 5

    can someone show me how this would be done please? thanks
    HI

    2x+y=9 --1

    From 1 , y=9-2x

    (x-2)^2+y^2=5

    Substitute (x-2)^2+(9-2x)^2=5

    x^2-4x+4+81-36x+4x^2-5=0

    x^2-8x+16=0

    x=4

    y=9-2(4)

     <br />
=1<br />
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  3. #3
    MHF Contributor
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    Talking

    Quote Originally Posted by mark View Post
    can someone show me how this would be done please?
    Ouch! They were supposed to have covered this in class and in your text before assigning questions on it!

    To learn "how this would be done", try an online lesson or two. Be sure to study the worked examples.
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