Explicaê

01

Considere as equações I, II e III.

 

(I) x + y + 3 = 0

(II) x2  + 2y + 2 = 0

(III) x2  + y2 – 5 = 0

 

No plano cartesiano, as representações gráficas das equações I, II e III correspondem, respectivamente, a

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