Mashaal Masha
$$5x+7y=1$$ $$ax+by=1$$

In the given pair of equations, $a$ and $b$ are constants. The graph of this pair of equations in the $xy$-plane is a pair of perpendicular lines. Which of the following pairs of equations also represents a pair of perpendicular lines?
Difficulty: Hard
A: 

$10x+7y=1$

$ax-2by=1$

B: 

$10x+7y=1$

$ax+2by=1$

C: 

$10x+7y=1$

$2ax+by=1$

D: 

$5x-7y=1$

$ax+by=1$

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