Question

x+y=7 _____ x-y=5 me ajuda ai​

Answer 1

Resposta:

Olá bom dia!

x + y = 7

x - y = 5

_______

x = 5 + y

5 + y + y = 7

2y = 7 - 5

y = 2/2

y = 1

x = 5 + 1

x = 6

S = { 6 ; 1 }