Ans: A
Let $P=(x,y)$.
Let $P=(x,y)$.
$\begin{array}{rcl}
AP & = & BP \\
\sqrt{(x-2)^2+(y-5)^2} & = & \sqrt{(x-4)^2+(y-(-1))^2} \\
x^2-4x+4+y^2-10y+25 & = & x^2-8x+16 +y^2+2y+1 \\
4x -12y +12 & = & 0 \\
x-3y+3 & = & 0
\end{array}$
