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Math Help - Equation of circles

  1. #1
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    Equation of circles

    Atached the question....

    i know how to do part a, but not b and c. Do I sub in Or something? Like sub in x=3?
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  2. #2
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    Re: Equation of circles

    Quote Originally Posted by Thorpelizts View Post
    Atached the question....
    i know how to do part a, but not b and c. Do I sub in Or something? Like sub in x=3?
    You say you have done part (a).
    Then you should have an equation that looks like:
    (x-h)^2+(y-k)^2=r^2 where (h,k) is the center and r is the radius.

    That is also the way to do part (c), only 'unpack it'

    As for part (b), you need to show that the point (-3,k) is on the circle.
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    Re: Equation of circles

    So here's my a, how do I unpack it?
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  4. #4
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    Re: Equation of circles

    That is also the way to do part (c), only 'unpack it'





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