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.

- anonymous

- schrodinger

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- anonymous

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.

- anonymous

so is the answer a cause their slopes are different?

- anonymous

I dont like math -.- im going with B

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- anonymous

oh crap i meant C

- anonymous

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

- anonymous

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

- anonymous

He's right. You're lazy.

- anonymous

I gave you the procedure, follow it!

- anonymous

omg fine give me a second!

- anonymous

So its -2/3

- anonymous

and since on is negative they are perpendicular?

- anonymous

one*

- anonymous

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

- anonymous

oh wait hold on

- anonymous

1/8

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

Same slope = parallel

- anonymous

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

- anonymous

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

- anonymous

-6/5

- anonymous

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

- anonymous

ohh so the answer is B woop yay :D

- anonymous

:D

- anonymous

you are awesome :) Thanks so much!

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