Question

Find the image of O (0,0) after two reflections, first across L1 and then across L2:

L1: y = 2
L2: x = -3

(2, -6)
(4, -6)
(-3, 2)
(-6, 4)
@welshfella

Answer 1

@amistre64

Answer 2

wow, reflecting the origin around 2 straight lines ...

Answer 3

how far away is 0,0 from y=2?

Answer 4

draw an xy plane if you want to see it clearly :)

Answer 5

my xy planes always crash ..

Answer 6

would the answer be c?

Answer 7

i was telling that to our fellow poster :)

Answer 8

well, the answer would be after the process

how far away is 0,0 from the y=2 line?

Answer 9

2

Answer 10

then a reflection (think of a mirror placed at y=2) gets us twice as far away as were we started

what is twice of 2?

Answer 11

4

Answer 12

then the solution must have a y=4 in it

does c have a y=4?

Answer 13

d

Answer 14

d is the only one yes :) so we dont even need to try the x part