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# 2.15: Line Graphs to Display Data Over Time

Difficulty Level: At Grade Created by: CK-12
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Practice Line Graphs to Display Data Over Time

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### Vocabulary Language: English

$x-$axis

The $x-$axis is the horizontal axis in the coordinate plane, commonly representing the value of the input or independent variable.

$y$ axis

The $y$-axis is the vertical number line of the Cartesian plane.

Coordinate grid

The coordinate grid is formed by a horizontal number line and a vertical number line that cross at the (0, 0) point, called the origin. The coordinate grid is also called a Cartesian Plane or coordinate plane.

Coordinates

The coordinates of a point represent the point's location on the Cartesian plane. Coordinates are written in ordered pairs: $(x, y)$.

Line Graph

A line graph is a visual way to show how data changes over time.

Ordered Pair

An ordered pair, $(x, y)$, describes the location of a point on a coordinate grid.

Origin

The origin is the point of intersection of the $x$ and $y$ axes on the Cartesian plane. The coordinates of the origin are (0, 0).

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