Question

2. 2x + 3y = 5 and 4x+6y=k are the pair of linear equations in two variables are coincides each other, then the value of k is A) 2 B) 3 C) 5 D) 10​

Answer 1

Answer:

K= 10

D is correct answer

Answer 2

Answer:

$2x \times 4 + 3y \times 4 = 5 \times 4 \\ 4x \times 2 + 6y \times 2 = k \times 2 \\ 8x + 12y = 20 \\ - 8x - 12y = 2k \\ \binom{8x + 12y = 20}{ -8x - 12y = 2k} \\ = 20 = 2k \\ or \: k = \frac{20}{2} = 10 \:$

your answer is D)10