You can put this solution on YOUR website! solve using
elimination x²+y²=4 , x²-y=4.
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x^2 + y^2 = 4
x^2 - y = 4
-------------------------------- Subtract
y^2 + y = 0
y = 0, -1
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y = 0 --> x = -2, 2
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y = -1:
x^2 + 1 = 4
