Nikkibaby71410 2 years ago 16. Is the line through points P(–8, –10) and Q(–5, –12) perpendicular to the line through points R(9, –6) and S(17, –5)? Explain. (1 point) Yes, their slopes are different. No, their slopes are not opposite reciprocals. No, their slopes are not the same. Yes, their slopes have the same number in them.

1. BluFoot

Use (Y2-Y1)/(X2-X1) to find the slopes of each lines. If one is the negative reciprocal of the other, then they are perpendicular.

2. Nikkibaby71410

so is the answer a cause their slopes are different?

3. Nikkibaby71410

I dont like math -.- im going with B

4. Nikkibaby71410

oh crap i meant C

5. Nikkibaby71410

cause if thier slopes are different then its not perpendicular. its C

6. Nikkibaby71410

No im great with every other class i just hate math!

7. BluFoot

He's right. You're lazy.

8. BluFoot

I gave you the procedure, follow it!

9. Nikkibaby71410

omg fine give me a second!

10. Nikkibaby71410

So its -2/3

11. Nikkibaby71410

and since on is negative they are perpendicular?

12. Nikkibaby71410

one*

13. BluFoot

Ok the slope of the first one is -2/3. What about the second one?

14. Nikkibaby71410

oh wait hold on

15. Nikkibaby71410

1/8

16. Nikkibaby71410

So -2/3 and 1/8 and those are perpendicular right cause one is a negative?

17. Nikkibaby71410

I thought if something had the same slope than meant it was perpendicular?

18. BluFoot

They're not perpendicular because one is not the negative reciprocal of the other.

19. BluFoot

If they were 2/3 and -3/2, they would be perpendicular. Or 7/8 and -8/7. Or 15/100 and -100/15

20. BluFoot

Same slope = parallel

21. Nikkibaby71410

what exactly does that mean -.- i feel so dumb im 18 and dont know this pellet

22. BluFoot

Negative reciprocal means you invert the fraction and make it negative. So can you find the negative reciprocal of 5/6?

23. Nikkibaby71410

-6/5

24. BluFoot

Good :) So if the slopes aren't negative reciprocals of each other, they're not perpendicular!

25. Nikkibaby71410

ohh so the answer is B woop yay :D

26. BluFoot

:D

27. Nikkibaby71410

you are awesome :) Thanks so much!