Example
 

Draw the graph of y = 2x + 1

First we need a table of values.

x	-2	-1	0	1	2	3
2x	-4	-2	0	2	4	6
+1	1	1	1	1	1	1
y	-3	-1	1	3	5	7

We can then plot the x and corresponding y values on a graph.

Graph of the function y = 2x + 1