Question

what could be explained form the straight horizontal line observe at the beginning and end of the graph

Answer 1

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Answer 2

a graph is a visual way of representing data in a manner that is simple to understand and analyse ,there are many other ways of representing data for example through pie chats ,pictorials and many more .graphs can be of different types for example there are bar graphs and linear graphs .but in all they are used to represent data of for example the slope of a curve

the horizontal line usually referred  to as the x axis ,this is a representation of the independent variable while the vertical line at the edge is the y axis or the values of the dependent variable