NCERT / CBSE NOTES : Chapter Summary
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.