IDNStudy.com, ang iyong platform ng sanggunian para sa pangkomunidad na mga sagot. Hanapin ang impormasyon na kailangan mo nang mabilis at madali sa pamamagitan ng aming komprehensibo at eksaktong platform ng tanong at sagot.

Find the equation of a circle passing through the intersection of 4x+y-4=0 and x-y-6=0 with center (-1,-3)

Sagot :

(x+1)^2 +(y+3)^2 =8.08
4x+y-4=0 
x-y-6=0   

Using the process of elimination, we will get x=2 and y=-4. Therefore, the circle passes through point (2, -4).

To find the radius of the circle, use the distance formula.
d = [tex] \sqrt{(2-(-1))² + (-4-(-3))²} [/tex] = √10

The equation of a circle with centre at (h,k) and radius r is 
(x-h)² + (y-k)² = r²

Therefore, the equation of the circle is 
(x+1)² + (y+3)² = 10    

In general form, 

x² +2x +y² +6y = 0