Question

ME AJUDEM POR FAVOR

| x + y = 7
| x - y = 1​

Answer 1

Resposta:

$\left \{ {{x+y=7} \atop {x-y=1}} \right. = \left \{ {{x+y=7} \atop {x=1+y}} \right. \\x+y=7\\1+y+y=7\\2y=7-1\\2y=6\\y=\frac{6}{2}\\ y=3\\\\x=1+y\\x=1+3\\x=4$

Explicação passo a passo:

Answer 2

Resposta:

x + y = 7
4+3 = 7;

x - y = 1
2 - 1 = 1