Algebra
posted by Patrick .
How can you determine if two lines are perpendicular?

you can find the slope of the two lines...when it is perpendicular
m1*m2=1
m1=one of the slope
m2=the second slope
if you multiply the slopes together, you will get 1 if it is perpendicular. 
Multiply the slope of one by the slope of the other. If the product is 1, they are perpendicular.