Question

$\left \{ {{x-2y=6} \atop {x.y=8}} \right.$

Answer 1

Resposta:

(6+2y)*y=8

2y2+6y=8

2y2+6y-8=0(:2)

y2+3y-4=0

^=3*2-4*1*(-4)

^=9+16

^=25

y=(-3+/-v25)/2

y=(-3+/-5)/2

y'=(-3+5)/2=2/2=1

y"=(-3-5)/2=-8/2=-4

x=6+2y

x'=6+2*1=6+2=8

x"=6+2*(-4)=6-8=-2

S:[(8,1);(-2,-4)]

Explicação:

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