Question

Which of the following matrices would be used in matrix multiplication to find the reflection about the line y = -x?
Answer
A. [-1,0]
[0,-1]
B. [1,0]
[0,-1]
C. [0,1]
[-1,0]
D. [0,-1]
[-1,0]

Answer 1

@cwrw238

Answer 2

we did this ...yesterday?

Answer 3

reflection thru the y=-x line gives us:

(a,b) -> (-a,-b)

run a,b thru to find the right one

Answer 4

i know but i got it wrong

Answer 5

amistre has right method
you pre multiply by the matrix and see what values give the reeflection
if you take the point (-1,-1) it will reflect to (1,1)