The slope of a line is - 3. Find the slope of a line that is perpendicular to this line. A) - 3 B) - 1/3 C) 1/3

For lines to be perpendicular their slopes must be negative reciprocals of one another, mathematically:

m1*m2=-1

In this case the perpendicular line will have a slope that satisfies:

-3m=-1 divide both sides by - 3

m=-1/-3

m=1/3