y-axis The vertical number line in a coordinate graph. The line in the coordinate plane, usually vertical, or in space, containing those points whose first coordinates (and third, in space) are 0.
y-coordinate The second coordinate of an ordered pair or ordered triple.
yard (yd) A unit of length in the U.S system of measurement equal to 3 feet or 36 inches.
The y-coordinate of a point where a graph crosses the y-axis.
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