Two lines are parallel if they have the same slope. Two lines are perpendicular if the product of their slopes is . So, find the slope of the line you are given. That is the same slope as the parallel line you want to find. Take its negative reciprocal to get the slope for the perpendicular line. Then, use the Point-Slope form for the equation of a line to find the line with slope equal to the given line that passes through (4,3), and again to find the equation for the line with slope equal to negative the reciprocal of the given line that passes through (4,3).