Объясните, пожалуйста, как построить график по системе уравнения


[tex]\left \{{f(x)={-\sqrt{x} } \atop {f(x) = -\frac{3}{x} }} \right.[/tex]

при x ≽ 0,
при x ≺ 0


Найдите f(-1), f(9)
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