Math
posted by Diana .
How can you determine if two lines are perpendicular?

find their slopes.
If the are the opposite reciprocals of each other, they are perpendicular.
or
if their product is 1 they are perpendicular. 
thank you, But what if the product is something other than 1 Could it still be perpendicular? Why or Why not?

nope, if the product is not 1, they are not perpendicular
If the slopes are opposite reciprocals, their product will always be 1. So that is the basic condition.
e.g. slope of first = 4/5
slope of second = 5/4
(4/5)(5/4) = 1 
Thank you!
Respond to this Question
Similar Questions

alg.
Determine which two equations represent perpendicular lines. a) y=2x  6 b) y=1/2x + 6 c) y= 1/2x + 6 d) y= 1/2x  6 I know that perpendicular lines have negative recipricals, but I'm having trouble with this problem. I think the … 
math
parallel and perpendicular lines Determine an equation of each of the following lines . *the line perpendicular to y4=0 and passing through the point (1,6) ** the line perpendicular to 3x12y+16=0 and having the same yintercept … 
algebra need by 10p cst
How can you determine if two lines are perpendicular? 
math needed by 12midnight
How can you determine if two lines are perpendicular? 
MATH
How can you determine if two lines are perpendicular? 
MATH
Post your 50 or more word response to the following in the assignment link: How can you determine if two lines are perpendicular? 
geometry
Martin drew a pair of perpendicular lines and a pair of parallel lines. Which of these statements best compares the pairs of perpendicular and parallel lines? 
Math
Two points for each of two lines are given. Determine if the lines are parallel, perpendicular, or neither. L1: (4, 6) and (3, 2) L2: (3, 1) and (7, 0) 
Math
1. Write the following reversible as a biconditional: If two perpendicular lines intersect, they form four 90* angles. A) Two intersecting lines are perpendicular if and only if they form four 90* angles. B) Two intersecting, perpendicular … 
Geometry
write the following reversible statement as a biconditional: If two perpendicular lines intersect, they form four 90 degree angles. Two intersecting lines are perpendicular if and only if they form four angles. Two intersecting, …