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If $2 x + 4 y - 5 = 0$ and $k x + 8 y - 10 = 0$ are parallel then the value of $k$ is

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answer is C.

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Detailed Solution

2 x + 4 y - 5 = 0 and k x + 8 y - 10 = 0

are parallel

$\Rightarrow \frac{a_{1}}{a_{2}} = \frac{b_{1}}{b_{2}}$

$\Rightarrow \frac{2}{k} = \frac{4}{8}$

$\Rightarrow k = 4$

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