I believe the best answer is C- the yellow rectangle was reflected over both axes
Divide both sides with -6 to then get 16=8-k. Then subtract 8 to both sides. to get 8=-k. Finally, divide both sides by -1 to get your answer, -8=k.
I think I conducted the equation correctly (:
f = 12.56
R = 6x + 5y
x = 7, R = 18
Substitute them in: 18 = 6(7) + 5y
18 = 42 + 5y
-24 = 5y
y = -24/5
It’s already in its simplest form