Find the equation of concentric circle x^2+y^2 +4x+6y =11 passing through the points 5,4
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through the point passing cincentric circle let be P=(x,y)=(5,4)
x=5,y=4
(5)^2+(4)^2+4*5+6*4=11
25+16+20+24=11
25+16+20+24-11=0
74=0.
i.e is the equation for concentratic circle is 4x+6y=74-11
4x+6y=63
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