# Equation of a line problem

equation of a line problem!!!

The points A and B have co-ordinates (3,4) and (7,-6) respectively. the straight line S passes through A and is perpendicular to AB.
FInd an equation for S, giving your answer in the form ax+by+c=0

Ok so im really stuck on this question. So far i have calculated the gradient of the line AB by doing (-6-4)/(7-3) and i got -2.5

How are the slopes of perpendicular lines related?

i have no idea how the slopes are related

cristo
Staff Emeritus