Question

Resolva o sistema e marque a alternativa correta..

Answer 1

$\left \{ {{y=2x-3} \atop {-y-1=-x}} \right.$
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-1=x-3
x=2
2=y+1
y=1
a)x+y=3 ⇒2+1=3Certo
b)xy/2=1 ⇒2·1/2=1⇒2/2=1Certo
c)x²-y²=3 ⇒2²-1²=3⇒4-1=3 Certo
d)2xy=8 ⇒2·2·1=8 Errado