Question

Resolva o sistema: Método Adição

X+y=-3
3x+y=1

Answer 1

{X+y=-3 ===> *(-1)
{3x+y=1 ↓

{-X-y=+3
{3x+y=1 =====> y=1-3x
------------- (+)
2x = 4
x = 2 ✓ =====> y=1-3(2)= 1-6 = -5 ✓