The slopes of two lines are 3 and - 1/3. Because of this, we can conclude that these two lines are which of the following?

Parallel

Perpendicular

Horizontal

None of these

When the slopes are equal, then we have parallel lines (which is not the case)

When the product of 2 slopes = - 1 (or one slope is the reciprocal of the other with different signs)

m₁ = 3 & m₂ = - 1/3

(3) x (-1/3) = - 3/3 = - 1, then the 2 lines are perpendicular