Question

the pair of equations x+2y=5 and 3x+ky+15=0 has a unique solution,then value of k is​

Answer 1

Answer:

k ∈ (R - {6})

Step-by-step explanation:

x + 2y = 5

3x + ky = - 15

$\frac{1}{3}$ ≠ $\frac{2}{k}$ ⇒ k ≠ 6

The pair of equations has a unique solution for k ∈ (R - {6})

For example, if $\frac{2}{k}$ = $\frac{5}{-15}$ ⇔ 5k = - 30 ⇒ k = - 6