function given by a table

To draw the graph of a function given by a table, we have to represent the x column in the horizontal axis and the y or f(x) column in the vertical axis.

Example:

   

 

Sometimes we use the table as an intermediate step, when we have the formula.

In the example: y = 2x - 1

 

 

 

Exercise: represent the graph of the function y = x2 + 1 (a parabola), by completing this table:

x y
-2  
-1  2
 0  1
 1  
 2  5

 

 

 

 

Solution:

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