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X^2/a^2 + Y^2/b^2 = 1

a = 2

b = 4

X^2/4 + Y^2/16 = 1

multiply through by 4

X^2 + Y^2/4 = 4

Y^2/4 = 4 - X^2

Y^2 = 4(4 - X^2)

Y^2 = 16 - 4X^2

Y = +/- sqrt(16 - 4X^2)

one of many ellipses possible ( don't for get to enter bot + and - terms )

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