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**NCERT / CBSE NOTES : Chapter Summary**

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__Linear Graphs__

**Line graph:**A line graph displays data that changes continuously over periods of time. A line graph usually shows a visual comparison between two quantities using a series of line segments. The line segments are joined end-to-end. The line graph, thus, allows us to observe trends easily. This is a major advantage of the line graph.

A linear graph is different from a

**line graph**. In a**linear graph**, the set of points on the graph line up in an orderly manner. A**linear graph**is a graph that consists of a single straight line segment.**Cartesian System:**when you draw a graph, you start with two straight lines at right angles to each other. The horizontal line is called the

**x-axis**of the graph. The vertical line is called the

**y-axis**of the graph. The

**x-axis**and the

**y-axis**together are called the

**axes**of the graph. The intersection point of the axes is called the

**origin**. Generally, the origin is denoted by the letter O.The position of a point that we draw on the graph is indicated by a pair of numbers within brackets – these are called the

**coordinates for that point**.

The graph of a proportional relationship results in a linear graph. A proportional relationship is expressed as an equation containing two variables. An

**independent**variable can have any value. A**dependent**variable’s value is determined by the independent variable.
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