## Tahmina 2 years ago help with transformation

1. Tahmina

3. harsimran_hs4

about the line y = x because two of the coordinates lie on the line itself and other two are mirror images of each other about the line y = x

4. Tahmina

okay

5. Tahmina

what does that mean?

i think D.

7. Tahmina

im thinking d too

yes because it will rotate due same points on x-axis.

9. harsimran_hs4

well D won`t work because rotation by 180 would result in reflection about y axis

10. Tahmina

11. terenzreignz

No it doesn't, @harsimran_hs4 Consider rotating the line y=x 180 degrees wrt the origin, you don't get the line y = -x

12. Tahmina

im thinking d makes sense

13. Tahmina

well does it?

14. terenzreignz

I vote yes :)

15. harsimran_hs4

well then tell me what is the reflection of point (-3,1) about line y = x ?

16. Tahmina

ill notify you if you are correct or not okay?

17. terenzreignz

Easier to see that the reflection of the point (3,2) about the line y=x is (2,3) which is not on the parallelogram.

18. harsimran_hs4

well point is (-3, 1) not (3, 2) i am considering

19. terenzreignz

Well, now that you mention it, the image is (1,-3)

20. harsimran_hs4

(-3, -3) and (3,3) lie on the line so after reflection they will also lie on the line and remain where they were and (-3, 1) and (3, -1) interchange their position

21. terenzreignz

But if it's to be the reflection with respect to the line y=x, then the image of each and every point must still be on the parallelogram, and the image of (-3,1), which is (1,-3) is not on the parallelogram.

22. harsimran_hs4

agreed my bad!! but how does d come out to be the solution?

23. terenzreignz

Because A, B, and C were wrong? lol

24. harsimran_hs4

LOL!! expected some good arguments tough

25. terenzreignz

I'm really not good at explaining geometric concepts, these things just come to me sorta instinctively :(

26. harsimran_hs4

cool got hold of it ...... FINALLY I AGREE D IS RIGHT!!