A line L passes through the points (2, 3) and (6, 5) in the xy-plane. What is the slope of a line that is perpendicular to line L?

✓ Correct Answer: Option A

The slope of line L is (5 - 3) / (6 - 2) = 2 / 4 = 1/2. The slope of a line perpendicular to L is the negative reciprocal of L's slope, which is -1 / (1/2) = -2.