HELP ASSAPP WILL MARK BRAINIEST!!!!!!

Answer:
The weight of each large box = 18.25 kgs
The weight of each small box = 13.25 kgs
Step-by-step explanation:
Lets L = weight of large box and S = weight of small box
so
2L + 6S = 116
5L + 3S = 131
Multiply equation 5L + 3S = 131 by (-2)
-10L - 6S = -262
So now you have 2 equations
2L + 6S = 116
-10L - 6S = -262
---------------------------Add to eliminate S
-8L = - 146
L = 18.25
2(18.25) + 6S = 116
36.5 + 6S = 116
6S = 79.5
S = 13.25