Answer:
y - 1 = 1/3*(x - 6)
Explanation:
point-slope form of a line:
y - y1 = m*(x - x1)
where x1 and y1 are the coordinates of the point included in the line and m is its slope.
Two lines are perpendicular when the multiplication of their slopes is equal to -1. In this case,
m*(-3) = -1
m = 1/3
Replacing this slope and the coordinates of point (6, 1) we get:
y - 1 = 1/3*(x - 6)