Question

x+y=12
x-y=3
ᴀʏᴜᴅᴀᴀᴀᴀ :( ​

Answer 1

bueno es el metodo de desigualdad

x+y=12

x=12-y

x-y=3

x=3+y

12-y=3+y

12-3=y+y

9=2y

9/2=y

y=9/2