Cari nilai x
x=9-y^{2}
Cari nilai y (complex solution)
y=-\sqrt{9-x}
y=\sqrt{9-x}
Cari nilai y
y=\sqrt{9-x}
y=-\sqrt{9-x}\text{, }x\leq 9
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x=9-y^{2}
Kurangi y^{2} dari kedua sisi.
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