The simplest way is when you have two different points (x1, y1) and (x2, y2), use these point to plot.
Here's an example: One point (0,4) or x1=0 and y1=4 and (3,1) x2=3 and y2=1.
The graph is shown below using these two points
There are other ways of graphing the line when given different characteristics of the line such as the slope.
I hope the above steps and explanation were helpful and enough to get started with other similar problems.
For FREE Step-By-Step videos in Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra and for Trigonometry visit http://www.FreedomUniversity.TV/courses/Trigonometry.
And good luck in your studies!
Respectfully,
Dr J
http://www.FreedomUniversity.TV