#### Answer

$5x + 10y = -7$
$5x + 10y = 0$

#### Work Step by Step

$5x + 10y = -7$
$5x + 10y = 0$
They are perpendicular to $10x - 5y = -7$ because they have a slope of $m_{perpendicular}=-\frac{5}{10}=-\frac{1}{2}$, which is the negative reciprocal of the slope of $10x - 5y = -7$ ($m=2$)