Question

{x+2y=13
{x-y=7

s={9,2}​

Answer 1

Resposta:

S={ ( 9 ; 2)}

Explicação passo-a-passo:

x+2y=13

x-y=7 . (-1)

___________

x+2y=13

-x+y=-7

__________

2y+y=13-7

3y=6

y=6/3

y=2

x+2y=13

x=13-2y

x=13-2.(2)

x=13-4

x=9