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

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

Algebra.Com

Question 687238: what must be true about the equations of the two lines
for their graphs to be perpindicular?
Answer by jim_thompson5910(35256) (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.
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