Question

ahhhhhhhhh ayudaaaaaaaaaa :(​

Answer 1

Explicación paso a paso:

(x+y) /3=4

x+y=12

x=12-y

Reemplazando

(x-y)/4 =5

x-y=20

12-y-y=20

-2y=8

y= - 4

x=12-y

x=16