Question

Two lines are perpendicular when....

o the product of their slopes is -1.
o the product of their slopes is greater than 0.
o they have the same slope.
o their slopes are undefined.

Answer 1

perpendicular slopes are negative inverses of eachother. Create an example and try it out

Answer 2

If the slope of a line is 3/4 the perpendicular slope is -4/3 (negative inverse) so whet is the product of them?

Answer 3

No you're not correct because if two lines have the same slope, then they are parallel.

Answer 4

@jim_thompson5910: I understand. I forgot.

Answer 5

that's ok

Answer 6

which one do you think it is?

Answer 7

I think the second one; the product of their slopes is greater than 0.

Answer 8

say the two slopes are equal (to say 3), the product of those two slopes is 3*3 = 9, which is greater than 0

Answer 9

Okay, I understand. So, I'm correct?

Answer 10

no

Answer 11

just because the product is greater than 0, it doesn't mean the lines are perpendicular

Answer 12

So, I say two lines are perpendicular when their slopes are undefined.

Answer 13

if the slope of one line is undefined, what's going on with the line?

Answer 14

@jim_thompson5910 why are you over complicating this. Two perpendiculra slopes have a product of -1

Answer 15

I'm trying to get the person who asked this question to think about the answer...don't give them the answer

Answer 16

@TAKEBACKMATH: Thank you!
@jim_thompson5910: The slope would be vertical if one line is undefined. Don't worry though, even if I know the answer I still want to know how you got it, and how I could solve it on my own; which I usually/eventually am able to.

Answer 17

@jim_thompson5910: Just to let you know, I am going to close this question right now. However, I would still like you to further explain to me why it is that certain answer please. I just need to ask another question in a new thread, but you're offline at the moment.