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anonymous
 5 years ago
How can you determine if two lines are perpendicular?
anonymous
 5 years ago
How can you determine if two lines are perpendicular?

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chaise
 5 years ago
Best ResponseYou've already chosen the best response.0There gradients will multiply to give negative one (1). :)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0if lines are perpendicular their dot product will be 0 zero

chaise
 5 years ago
Best ResponseYou've already chosen the best response.0For example. If you have a line given by y = 10x+3 and also y=1/10x+5 Where the gradient is marked by the number before the x. The two numbers multiply to give negative one. Make sense?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Their ratio will be the same. Ex: 10x + 5 and 20x+10. to get from 10x+5 to 20x+10, you multiply the first one by 2

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0If the product of the two gradients is 1 they are perpendicular.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0*you must solve for the dot product. if you want it to be parallel, ratio must be the same

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You all need to remember your algebra 2. At this stage it's just a matter of comparing slopes. If the two slopes are perpendicular they will multiply to make 1. Or you can find one given the other by the fact that they will be negative reciprocals of each other. If you are given a slope of 10 as in the example above, a perpendicular slope will be 1/10. And for any slope r, a perpendicular slope will be 1/r.
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