Question 1017074
Midpoint of those two givens {{{system(x=(4-6)/2=-1,y=(0-3)/2=-3/2)}}};


Slope of the segment of those two givens,  {{{(-3-0)/(-6-4)=3/10}}};
Slope of the perpendicular bisector of the SEGMENT for the given points will be  {{{-10/3}}}.


The perpendicular bisector of the SEGMENT whose endpoints are (4,0) and  (-6,-3) which using the point-slope form equation is   {{{highlight(y+3/2=-(10/3)(x+1))}}}; do what you need with it.