Btw, how do I find my previous posts on here ?
OK, can someone explain. I know the gradient of a line, and i'm being asked to find the equation of the line perpendicular to it.
The gradient of the line is 1/2. So m1m2 = -1, so m2 = - 2 ?
So how do I find the equation - in the form ax + by + c = 0
The points are A (-1, -2 ) B ( 7 , 2) and C (6, 4)