Question

X+3y =6 2x+y =-3
Método da substituição

Answer 1

Resposta:

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

$x=6-3y\\\\2.(6-3y)+3y=-3\\12-6y+3y+3=0\\-3y+15=0\\-3y=-15 .(-1)\\3y=15:(3)\\y=5\\\\x=6-3y\\x=6-3.5\\x=6-15\\x=-9\\\\(x,y)=(-9,5)$