Question

. If a pair of linear equations x+2y=3 and 2x+4y=k are coincident, then the value of ‘k’ is ------

Answer 1

k=6

as both equations will equal and will coincide only then

[x+2y=3]2 as we need to make equations same

2x+4y=6

compare with

2x+4y=k

k=6

Answer 2

Answer:

k = 6

Step-by-step explanation:

given, x+2y=3 and 2x+4y=k are coincident

∴ if the equations are coincident , they can be written as a

a1/a2 = b1/b2 = c1/c2

a1 = 1, a2 = 2, b1 = 2, b2 = 4, c1 = -3, c2 = -k

1/2 = 2/4 = -3/-k

1/2 = -3/-k

-k = -3 * 2

-k = -6

k = 6