Question

Find the value of k, if the lines represented by the equation 9x + (k+1)xy + 4y = 0 are coincide.​

Answer 1

Answer:

Correct option is 9

9

If eqnofline is ax²+ 2bxy + by² = 0

coincident line

h² = ab

in our case

(−6)² = k⋅4

k = (36/4) = 9