E
Editor
Sep 18, 2022
Two lines $l_{1}$ and $l_{2}$ m with respective slopes $m_{1}$ and $m_{2}$ are perpendicular if:
Difficulty: Easy
A:
$m_{1}=m_{2}$
B:
$m_{1}=\frac{1}{m_{2}}$
C:
$m_{1}=-\frac{1}{m_{2}}$
D:
$m_{1}m_{2}-1=0$
ID: 63273db9ca83163ac3a1116f