Jawabanmu

2014-06-19T13:23:23+07:00
(Ax+By+C)/√(A²+B²)=R
(3.5+(-4)(-2)+7/√(3²+(-4)²)=r
(30/√25)=r
r=6
(x-x1)²+(y-y1)²=r²
(x²-10x+25)+(y²+4x+4)=36
x²+y²-10x+4y-7=0