# If the slope of a line is -1/2, what is the slope of a line that is perpendicular to it?

The Product of the Slopes of two perpendicular lines is always $- 1$
$\left(- \frac{1}{2}\right) \cdot$(Slope of the Perpendicular Line)$= - 1$
Multiplying both sides with $- 2$, we get
color(green)(Slope = 2