Question

calcule o sistema
{x+3y=5
{2x-y=-4​

Answer 1

Resposta:

x+3y =5      2x – y = -4 x=5-3y substituindo  2x – y = -4   2 (5-3y) – y = -4   10-6y-y=-4    14=7y     y=2   x+3y=5   x+3.2=5    x=-1 Provando]   2.-1-2=-4