Question

Which of the following pairs of slopes are of perpendicular lines?


1/2 and 2
3/4 and -4/3
-2/5 and -5/2

Answer 1

Any ideas?

Answer 2

$$m=\frac{-1}{m'}$$ where m and m' are perpendicular

Answer 3

3/4 and -4/3 is the answer, im not sure how, i just guessed but i got it right

Answer 4

what is the reciprocal of 3/4?

Answer 5

4/3

Answer 6

Correct, now the formula above says take the opposite of that and that is the slope of the perpendicular.

Answer 7

the opposite of 4/3 is -4/3?

Answer 8

Yes :)

Answer 9

So, $$\frac{3}{4}$$and $$\frac{-4}{3}$$ are slopes of lines that are perpendicular.

Answer 10

thank you(:

Answer 11

Thank you for trying :)