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Math Help - equation of the circle

  1. #1
    rcs
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    equation of the circle

    Find the equation of a circle in radius center form with
    center at (-3,-5) and tangent to the y- axis.


    im so confused with how the problem has stated on the centers. i can hardly understand the problem. please help.

    Thank you
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  2. #2
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    Re: equation of the circle

    (x-h)^2+(y-k)^2 = r^2

    where the circle is centered at (h,k) and r is the radius.

    now ... what is the distance from (-3,-5) to the y-axis?
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  3. #3
    rcs
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    Re: equation of the circle

    i got it...

    (x + 3)^2 + (y + 5) = 9

    thanks
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