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**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

But now i dont know what to do please help