Question

if the pair of linear equations x+2y=3 and 2x4y=k are coincide then the value of 'k' is
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Answer 1

$x + 2y = 3 \\ 2x + 4y = k$

$multiply \: equation \: 1 \: by \: 2$

$2x + 4y = 6 \\ 2x + 4y = k$

$change \: sign \: of \: equation \: 2$

$2x + 4y = 6 \\ - 2x - 4y = - k$

$0 = 6 - k$

$k = 6$

$add \: both$