Y - Math terms glossary

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.

Ex: in the coordinate pair (3,-2), the negative two is the y-coordinate.

yard (yd)  A unit of length in the U.S system of measurement equal to 3 feet or 36 inches.
y-intercept The y-coordinate of a point where a graph crosses the y-axis.