IDNStudy.com, ang iyong mapagkukunan para sa malinaw at mabilis na mga sagot. Sumali sa aming platform ng tanong at sagot upang makatanggap ng mabilis at eksaktong tugon mula sa mga propesyonal sa iba't ibang larangan.

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