Real life graphs: are graphs representing real things, these can be straight line graphs and curved graphs.

Gradients: Gradient in real life graph represents a rate of change.

Reciprocal graph: is of the form  y= a ⁄ x , where a is a constant.

Distance-time graph: the gradient of the line is equal to the speed of the object. The greater the gradient (the steeper the line) the faster the object is moving.