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For what value of k will the equations x...

For what value of `k` will the equations `x+2y+7=0,2x+k y+14=0` represent coincident lines?
(A). 2
(B). 6
(C). 4
(D). 5

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Given
`x+2y+7=0,2x+k y+14=0`
The given system of equations is of the form
`a_1​x+b_1​y+c_1​=0`
`a_2​x+b_2​y+c_2​=0`
where, `a_1​=2,b_1​=2,c_1​=7` and `a_2​=2,b_2​=k,c_2​=14 ...
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