Question

Resolva os sitemas de equacões.
{ x+y=2
{×_y=_4

Answer 1

Resposta:

X = 3 e Y = -1

Explicação passo a passo:

$+\left \{ {{x+y=2} \atop {x-y=4}} \right.\\ \\=>x+x+y-y=2+4\\\\=>2x=6\\\\=>x=\frac{6}{2}\\\\=>x=3$             $x+y=2\\\\3+y=2\\\\y=2-3\\\\y=-1$