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| two numbers whose product is 1; x and 1/x are reciprocals. |
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| operations that undo each other, such as addition and subtraction or multiplication and division |
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| a plane formed by the intersection of a horizontal number line, the x-axis, and a vertical number line, the y-axis |
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| the horizontal axis on a coordinate plane |
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| the vertical axis on a coordinate plane |
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| any of the four sections of a coordinate plane separated by the x-axis and y-axis |
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| the second number of an ordered pair |
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| the first number of an ordered pair of numbers |
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| the point on a coordinate plane where the x-axis and the y-axis intersect, located at (0,0) |
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