Question

8th grade math help please?

What is the mapping rule for a 180 degree rotation about the origin?

A. (x, y)g(–y, x)
B. (x, y)g(–y, –x)
C. (x, y)g(–x, –y)
D. (x, y)g(x, –y)

Answer 1

@ILovePuppiesLol @ijlal @AloneS @Photon336

Answer 2

welcome to open study :)

Answer 3

Thanks

Answer 4

by now you may not know this,but I am awful at math

Answer 5

Oh ok

Answer 6

you change the sign of both the x and the y coordinates.

Answer 7

lol excuse my poorly drawn figure, but the original point was (1,1) --> (-1,-1) what do you notice about it?

Answer 8

One is positive other is negative

Answer 9

Same numbers

Answer 10

what happened to x and y?

Answer 11

@Melissa520 if our original function was (1,1) what happened when it became (-1,-1) ?

Answer 12

It went negative...

Answer 13

I'm sorry I am really bad at math especially geometry.

Answer 14

so both became negative. so we change the sign of both the x and the y coordinates

say if I had something like this

(2,-2) ---> (?,?) what would it become if I rotated it 180 degrees through the origin?

Answer 15

(-2,2)?

Answer 16

I'm guessing that's not right?

Answer 17

explain to me what you did

Answer 18

then i'll tell you whether it's right or not

Answer 19

@Melissa520

Answer 20

Ok

Answer 21

Well I just switched them because isn't than what your supposed to do?

Answer 22

If I had to choose a answer I would say it is C.

Answer 23

good work (2,-2) --> (-2,2)

Answer 24

So the answer is C correct?

Answer 25

C. (x, y)g(–x, –y)

Answer 26

yeah

Answer 27

Ok thanks @Photon336