Line has equation y = 5x + 2, and line m with equation y = ax + b is perpendicular to line l at (4,-3). What is the y-coordinate of the point on m that has x-coordinate 6?

Line has equation y = 5x + 2, and line m with equation y = ax + b is perpendicular to line l at (4,-3). What is the y-coordinate of the point on m that has x-coordinate 6?