Question 379390
perpendicular lines have slopes which are negative-reciprocals of each other
eg. 3/2 and -2/3


when the equation is in standard form (as in this problem) ; swapping the x and y coefficients
and changing one of the signs
will give the perpendicular line


to have the line go through a particular point , plug the coordinates into the equation
to get a new constant term


4x + 3y = 10 is perpendicular to 3x - 4y = 10


4(-1) + 3(2) = 2 ___ 4x + 3y = 2 goes through (-1,2)