graph functions

In a function each input term is straight lined with one matching output term of that function. In mathematics, there are so many methods through which we can define function. Some functions are described by formula and some one by algorithm. Both the method tells that how to work out the output value for a given input value. Some of the functions are represented with the help of graph, so that types of function are said to be graph functions. In some of the cases function are represented with the help of table which gives us output values for selected input. (know more about graph functions, here)

We can plot the function graph by different methods. In some of the cases, first assume any function which contain value of two variable (suppose x and y), then put different values to find the values of other variable. In this way we can have a set of different values and at last put these values in the plane to get a graph. One other method to plot a function graph is shown below:

For example: let we have given a function:

F (x) = a, if a = 1,

b, if a = 2,

c, if a = 3. Then we have to graph a function using these values.

So the function value is (1, a), (2, b), (3, c). In cubical form function can be written as:

F (a) = a² – 9a, if we plot a graph of this function, we get curve mention below:

Using above values we can easily plot a function graph.

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