Question

If the lines 4x + 3y – 1 = 0, x – y + 5 = 0 and kx + 5y – 3 = 0 are concurrent, then k is equal to

• A. 4
• B. 5
• C. 6
• D. 7

Answer 1

Answer: (C)

6

Answer 2

$\left| \begin{matrix} 4 & 3 & - 1 \\ 1 & - 1 & 5 \\ k & 5 & - 3 \end{matrix} \right|$ = 0 Ž k = ?