A line has a slope of - 3. What is the slope of a line perpendicular to it?

The slope of the perpendicular line is 1/3

Step-by-step explanation:

Perpendicular lines have slopes that multiply to negative 1

Let the slope of the line we are looking for be m

-3 * m = - 1

Divide each side by - 3

-3m / -3 = - 1/-3

m = 1/3

1/3

Step-by-step explanation:

The slope of a line perpendicular to it = - 1/m = - 1/-3 = 1/3