Question

qual o valor de x e y

Answer 1

Resposta:

$\left \{ {{3x+10y=1} \atop {5x-5y=-20}} \right. \\\\\left \{ {{3x+10y=1} \atop {x=-4+y}} \right. \\3(-4+y)+10y=1\\y=1\\x=-4+1\\x=-3\\(x,y)=(-3,1)$

Explicação passo-a-passo: