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y=x？ The image is a parabola with an upward opening;

Take (0,0) as the vertex, the Y axis as the axis of symmetry, and pass through the points (-1, 1) (1, 1).

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For the image of y=2x, the image of the proportional function is a straight line passing through the origin, and when k > 0, it passes through one or three quadrants.

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