If the line 3x - 4y + 7 = 0 and 2x + ky + 5 = 0 are perpendicular to each other, then the value of k is 1. 2. 3. 4.

Given, 3x - 4y + 7 = 0 and 2x + ky + 5 = 0 ⇒ 4y = 3x + 7 and ky = -2x - 5 ⇒ y = and y = Comparing both the equations with y = mx + c, Slope of first line = m 1 = Slope of second line = m 2 = Since, both the lines are perpendicular so, Hence, Option 1 is the correct option.