2019-II-24

16-06-2021 app.cch No Comments

Ans: A
For the straight lines are perpendicular to each other, the product of their slopes is

- 1

. Then we have

$\begin{array}{rcl} \frac{- 3}{2} \times \frac{- k}{12} & = & - 1 \\ 3 k & = & - 24 \\ k & = & - 8 \end{array}$