The slope of the line which is perpendicular to the line segment joining the points (8, -5) and (-4, 7) is : 1. -1 2. 1 3. 45° 4. -45°

By formula, Slope = Substituting values we get : Slope of line passing through (8, -5) and (-4, 7) = = -1. Let slope of line perpendicular to line segment joining points (8, -5) and (-4, 7) be m. We know that, Product of slopes of two perpendicular lines = -1. ∴ m × -1 = -1 ⇒ m = = 1. Hence, Option 2 is the correct option.