A. $\left\{\begin{array}{l}x+2 y=6 \\ y=-x^{2}\end{array}\right.$
B. $\left\{\begin{array}{l}x+2 y=-6 \\ y=-x^{2}\end{array}\right.$
c. $\left\{\begin{array}{l}x+2 y=6 \\ y=x^{2}\end{array}\right.$
D. $\left\{\begin{array}{l}x+2 y=-6 \\ y=x^{2}\end{array}\right.$
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