If two non-vertical lines have slopes and

MATHEMATICS · Single correct · CBSE · Mathematics · Straight Lines · Straight Lines

Problem

If two non-vertical lines have slopes

m_1

and

m_2

, which condition must hold for the lines to be perpendicular? (a)

m_1 m_2 = 1

(b)

m_1 m_2 = -1

(c)

m_1 + m_2 = 0

(d)

m_1 m_2 = 0