Hello everyone!

I am having problems solving a simple circle, problem, I would appreciate any help/guidance as I wasn't provided with references, so I'm having trouble solving this problem because I have no knowledge of the concepts! If someone could some me how to solve this problem I'd be grateful!

Find the centre and radius of the circle

X(Squared) + y(Squared) + 2x - 8y + 8 = 0

Find the centre and radius of the another circle which touches the y-axis at the origin and passes through (4, 2)

Compute the distance between the centres of the two circles, and whether they intersect at one point, two points or no points.

Find the parametric equations of the first circle. (what does parametric even mean?)

Regards,

Ziyad Basheer.