만약 x^2+2x+1+y^2-8y+16=0,y/x.10 만 화급!

만약 x^2+2x+1+y^2-8y+16=0,y/x.10 만 화급!

x^2+2x+1+y^2-8y+16=0
(x+1)^2+(y-4)^2=0
x=-1,y=4
y/x=-4