Question

Which figure shows a reflection of pre-image ABC over the y-axis?

Answer 1

i think B but im not sure.

Answer 2

@Directrix

Answer 3

to flip over the y axis, negate the x value

Take any point and perform this transformation

Answer 4

so by point you mean a b or c?

Answer 5

well A', B', or C'

Answer 6

okay i choose A now what do i do next?

Answer 7

find the coordinate of the point A'

Answer 8

the coordinate of A is 1 right?

Answer 9

I need a full point
(x,y)

Answer 10

1,1

Answer 11

whatever.
apply the function transformation (x,y)->(-x,y) to that point to find the new A

Answer 12

i dont know how to do that :/

Answer 13

if our point was 5,7, it'd become -5,7

read up on transformations and reflections over axes

Answer 14

okay i looked up a video on reflections over axis . and i think im understanding a bit more

Answer 15

so what would happen to (1,1)?

Answer 16

the points of the triangle is (1,1) would turn stll be 1,1 if we flip the triangle

Answer 17

-1,1 i mean

Answer 18

yeah, which choice does that match

Answer 19

C

Answer 20

oh wait no its B right?

Answer 21

How?

Answer 22

draw (-1,1) on this graph

Answer 23

nope

Answer 24

points are of the form (x, y)

Answer 25

ohh okay so it A

Answer 26

yeah

Answer 27

okay thanks bibby. :))

Answer 28

if you want a more visual way to look at it, the y axis is the vertical one, right?