Question

How do you find the equations of the lines through the point (a,c) that are parallel to and perpendicular to the line y = mx + b?

Answer 1

For a parallel line slope would remain m, and its equation in point slope for can be written y-c= m(x-a)

For a perpendicular line, slope would be `-1/m` and it equation in the point slope form can be written as y-c= `-1/m` (x-a)