Question

Usando-se o método da ADIÇÃO, resolva os seguintes sistemas

Answer 1

Resposta:

Vamos lá! Arrume primeiro esse sistema.

Letra A

$\left \{ {{3x-6=2y-6} \atop {18y-36+y=6x+9}} \right.||\left \{ {{3x=2y} \atop {19y=6x+45}}||y=3x/2$

$19.(\dfrac{3x}{2} )=6x+45\\\\\\\dfrac{57x}{2} =6x+45\\\\\\\dfrac{57x-12x}{2} =45\\\\\\\dfrac{45x}{2} =45\\\\45x=90\\\\x=90/45\\\\x=2\\\\\\\\y=3.2/2\\\\y=6/2\\\\y=3$