The "perpendicular bisector" of the line segment $\overline{AB}$ is the line that passes through the midpoint of $\overline{AB}$ and is perpendicular to $\overline{AB}$.
The equation of the perpendicular bisector of the line segment joining the points (1,2) and (-5,12) is y = mx + b. Find m+b.
slope: 2nd y-1st y/2nd x-1st x
find the slope and midpoint of the segment
the bisector passes through the midpoint
the slope of the bisector (perpendicular) is the negative reciprocal of the slope of the segment