Exactly how many minutes is it before eight o'clock, if 40 minutes ago, it was three times as many minutes past four o'clock?© BrainMass Inc. brainmass.com October 24, 2018, 6:57 pm ad1c9bdddf
Assume that it is Exactly x minutes before eight o'clock. By the given information, we have
This solution is comprised of a detailed explanation to answer exactly how many minutes is it before eight o'clock, if 40 minutes ago, it was three times as many minutes past four o'clock.
Perpendicular lines - Geometry and Coordinate Geometry
"How can you determine if two lines are perpendicular?"
This is what I understand out of it By definition, perpendicular lines intersect each other at 90 degree angle.
In co-ordinate geometry, product of their slopes is -1.