Question

two lines with slopes m₁ and m₂ are ______ if and only if m₁m₂ = -1. two lines with slopes m₁ and m₂ are dropdown if and only if m₁m₂ = -1.

Explanation:

In the study of lines in coordinate geometry (a subfield of Mathematics, specifically Geometry), the relationship between the slopes of two lines is a key concept. The formula \( m_1m_2=- 1 \) is the condition for two lines to be perpendicular. This is a fundamental geometric property where if the product of the slopes of two non - vertical lines is - 1, the lines intersect at a right angle (90 degrees).

Answer:

perpendicular