Respostas

  • Usuário do Brainly
2014-07-29T19:59:59-03:00
 \left \{ {{x+4y=0} \atop {3x+2y=5}} \right.

isola
x=-4y

subst/
3x+2y=5
3(-4y)+2y=5
-12y+2y=5
-10y=5
10y=-5  y= \frac{-5}{10} =- \frac{1}{2}

como
x=-4y

x=-4(- \frac{1}{2)}

x=2

S={(2,-1/2)}

2 5 2