Question

ajuda - me

3 x + y = 0
11 x - y = 42

Answer 1

3x + y = 0
y = -3x
Trocando os termos:
11x - ( -3x ) = 42
11x + 3x = 42
14x = 42
x = 42/14
x = 3
Se y = -3x
y = -(3x3)
y= -9