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Two super difficult math problems, please ask big brother and big sister for help.
x2+y2- 16=0 1

x2-3y+ 12=0 2

1-2

y2+3y-28=0

(y+7)(y-4)=0

So y 1=-7 y2=4.

Replace y 1=-7 with 1.

x2+49- 16=0

x2=-33

Hehe, I don't know how to solve it.

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