If c and d are constants, what is the slope of a line that is perpendicular to the line cx + dy - b = 3

Answer 1

If cx + dy - b = 3, then dy = -cx + b + 3

So, y = (-c/d)x + (b/d) + 3/d (This line has slope -c/d.)

Slope of perpendicular line = -1 / (-c/d) = d/c