# Math Help - Equation of circles

1. ## 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?

2. ## Re: Equation of circles

Originally Posted by Thorpelizts
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.

3. ## Re: Equation of circles

So here's my a, how do I unpack it?

4. ## Re: Equation of circles

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

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