Question

{-×+2y=3
{2x+y=4
qual e a resposta?​

Answer 1

Resposta:

{-x+2y=3   ==>vezes 2 ==> -2x+4y=6  (i)

{2x+y=4 (ii)

(i)+(ii)

0+5y=10

5y=10

y=2

usando 2x+y=4  ==> 2x+2=4  ==>2x=2 ==>x=1