Wednesday

April 16, 2014

April 16, 2014

Posted by **Adrianna** on Wednesday, March 21, 2012 at 11:21am.

(0, 0)

(6, 0)

(0, - 8)

You must include the appropriate sign (+ or -) in your answer. Do not use spaces in your answer.

x 2 + y 2 x y = 0

HELP PLEASE I NEED STEP BY STEP EXPLANATION!!

I KNOW THAT THE FORMULA IS =

x^2+y^+dx-ey+f=0

I JUST DON'T GET IT AND NEED SERIOUS EXPLANATION.

- Equation from Three Points*HELP* -
**drwls**, Wednesday, March 21, 2012 at 11:57amUse this standard circle equation:

(x-a)^2 + (y-b)^2 = c^2

Your three points tell you that:

a^2 + b^2 = c^2

(6-a)^2 + b^2 = c^2

a^2 + (b+8)^2 = c^2

The first two of these equations combine to give:

6-a = +or- a . Only + sign works.

a = 3

The first and third equations combine to give

b + 8 = +or- b

Only - sign works.

b = -4

c^2 = a^2 + b^2 = 25

c = +or- 5

So the equation that fits them all is

(x-3)^2 + (y+4)^2 = 25

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