alleryTwo non-vertical lines are perpendicular if and only if the product of their slopes is:
A$-\tfrac12$
B$0$
C$-1$
D$1$
Answer & Solution
Correct answer: C. $-1$
Perpendicular non-vertical lines satisfy m₁·m₂ = −1.
Keep practising Straight Lines and Conic Sections
Browse all Straight Lines and Conic Sections questions for GRE, or explore more Mathematics topics.
Related questions
The line 3x − 4y + 12 = 0 cuts the y-axis atThe intercept form of the equation of a line making intercepts a and b on the x- and y-axeThe distance between the parallel lines 3x + 4y = 7 and 3x + 4y = 12 isThe angle θ between two lines with slopes m₁ and m₂ satisfiesThe distance from the point (0, 0) to the line 3x + 4y − 25 = 0 isEquation of the line passing through (3, 4) and parallel to the line 2x − 3y = 5 isThe equation of the line passing through (2, −1) with slope 3 isThe slope-intercept form y = mx + c of the line 3x + 4y = 8 gives a slope of