Question

2x+y=-3/x-y=-1 metodo da comparaçao

Answer 1

{ 2x + y = -3 ---> y = - 3 - 2x ---(i)
{ x  -  y  = -1---> y = x -(-1) --> y = x + 1----(ii)

(i) = (ii)
-3 -2x = x+1
-3 - 1 = x + 2x
    - 4 = 3x ----> x = - 4/3
 
(ii)  y = x + 1 ---> y = -4/3 + 1 = - 1/3