Definition: Graph is a straight or a curved line, which shows the relationship of two, inter-dependent quantities.

TYPES OF VARIABLES, (OR QUANTITIES):

There are two types of variables or quantities.

- Independent Variables
- Dependent Variable

INDEPENDENT VARIABLE (QUANTITY):

The quantity, which is changed at will, is called independent variable

DEPENDENT VARIABLE (QUANTITIES)

The quantity, which changes according to any variation in the independent variable, is called dependent variable.

METHOD OF CONSTRUCTION:

A graph is plotted on a graph paper. While plotting a graph two mutually perpendicular lines (horizontal called X-axis and vertical called y-axis) are drawn on the graph. Point of inter-section of x and y axis is called point of origin. The independent variable quantity is usually taken along x -axis and dependent variable is taken along y-axis. Choose a suitable scale for both variables and. plot the corresponding values of both variables on graph. If the graph is a straight line the points should be joined by a scale rod. If the graph is a curve, the points should be joined by a smooth and free hand line.

ADVANTAGES OF GRAPH

- It shows the relation b/w two physical quantities.
- It shows the change in relation of two physical quantities
- On the basis of graph we can predict the nature of change in quantities.

USE OF GRAPH:

It is used to find the relation between two variable quantities.

Questions:

- What is Graph?
- What are the advantages of graph?
- Define use of graph?
- Explain construction of graph.

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