The x-axis is infinite. Any number can be on the x-axis of the coordinate plane. If you mean what is the y-coordinate, every point on the x-axis has a y coordinate of zero: (x, 0)
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Kristoffer, the x-axis is infinite, so any number can be on it. If you mean, what is the y value of a point on the x-axis, it is always zero: (x, 0)
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