Make a table of solutions for the equation, and then use the table to graph the equation.

Just graph one of them.
y = 2x -1

How do I make one, may I use microsoft Excel?

Excel to find values for this simple equation????

Just make a table

x | y , pick any x you feel like, then do the arithmetic

0 -1
1 1
2 3
3 5
4 7
-1 -3
-2 -5
....

You know it is a straight line, so all you really needed are two points, (I suggest a third to verify)