Question

Oi gente! Sistema....
{× - y = 3
{× - 2y = 1

Answer 1

{x - y = 3
{x - 2y = 1 y

x - 2( 3 - x) = 1
x - 6 - 2x = 1
x - 2x = 1 + 6
- x = 7 ×( - 1 )
x = - 7

y = 3 + x
y = 3 + ( - 7 )
y = - 4

par ordenado { - 7, - 4 }