Question 28
Coordinate Geometry3y = 4x − 1 and Ky = x + 3 are equations of two straight lines. If the two lines are perpendicular to each other, find K.
- A.−4/3
- B.−3/4
- C.3/4
- D.4/3
Show the answer and explanation
Answer: A (−4/3)
Explanation
The gradients are 4/3 and 1/K. For perpendicular lines their product is −1, so 4/(3K) = −1 and K = −4/3.