Which system of equations is represented by the graph?

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The graph of a system of a linear and a quadratic equation is shown.

y = - 3 x

y = x^{2} + 6

y = - 3 x

y = x^{2} - 6

y = 3 x

y = x^{2} + 6

y = 3 x

y = x^{2} - 6