SOLUTION: what must be true about the equations of the two lines for their graphs to be perpindicular?

Algebra ->  Test -> SOLUTION: what must be true about the equations of the two lines for their graphs to be perpindicular?      Log On


   

Question 687238: what must be true about the equations of the two lines
for their graphs to be perpindicular?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
their slopes must be negative reciprocals

this means that the product of the two slopes must be -1.