easy · GMAT Quant

Which of the following describes the set of all points (x, y) such that the distance from (x, y) to the x-axis is exactly twice the distance from (x, y) to the y-axis?

1. x^2 = 4y^2
2. y^2 = 2x^2
3. y^2 = 4x^2
4. y = (1)/(2)x
5. y = 2x

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