Question
how can you tell in geometry that the equations are parallel, perpendicular , neither, either?
Answers
Reiny
If the slopes of the lines are equal, the lines are parallel
if the slopes are negative reciprocals of each other, the lines are perpendicular, ( e.g. 5/3 vs -3/5)
if the slopes are negative reciprocals of each other, the lines are perpendicular, ( e.g. 5/3 vs -3/5)
bignig
parell is when lines are black