Write Equations Parallel/Perpendicular to Lines

Video (Parallel to Your Equation): http://www.virtualnerd.com/algebra-1/linear-equation-analysis/parallel-perpendicular-lines/parallel-lines/slope-intercept-from-point-and-parallel-line

Video(Perpendicular to Your Equation): http://www.virtualnerd.com/tutorials/?id=Alg1_10_1_14