Question

Which pair of slopes could represent perpendicular lines? please help

1/7, 7
1/2, 2/4
-3/4, 4/3
1/3, 1/ 3

Answer 1

When multiplying you will get -1. You just have to try them all.

Answer 2

You get -1 because perpendicular lines have slopes that are negative reciprocals of each other. One will have a/b and the other will have -b/a. When multiplied, you get -1.

Answer 3

i dont get it?

Answer 4

Hint: there is only one pair above that is for perpendicular lines. Try each line one at a time. What do you get for 7 x 1/7? Is it -1 or no?

Answer 5

no its not -1

Answer 6

so my answer = -1?

Answer 7

Since 7 x 1/7 does not produce -1, you can toss that one out because it is NOT indicative of slopes for perpendicular lines. Now you have to go to the next selection and test that one.

Answer 8

So, what is 1/2 times 2/4? Is that -1? If not, then toss that one too. If it is -1, then you have a pair of slopes for perpendicular lines. And so on. Test each line individually.

Answer 9

so im just x them all by 1?

Answer 10

You multiply the first number by the second number and see whether the product is -1 or not.

Answer 11

i got the ansqer is is the -3/4

Answer 12

Yes! It is the 3rd choice. Good work!