When two lines cross each other that becomes and intersection point. Go to the link below to do some examples.
http://www.ixl.com/math/algebra-1/solve-a-system-of-equations-by-graphing
Source: "Practicing Algebra 1 Math: 'Solve a System of Equations by Graphing'" IXL Learning. N.p., n.d. Web. 05 May 2015.
How to graph a linear equation.
Source: "Graphs of Linear Equations." YouTube. YouTube, n.d. Web. 05 May 2015.
A fun way how to learn how to graph with a song.
Source: "Graph! (WSHS Math Rap Song)." YouTube. YouTube, n.d. Web. 04 May 2015
