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HSA-REI.3

3. Solve linear equations and inequalities in one variable, including equations with coefficients represented by letters.

HSA-REI.6

6. Solve systems of linear equations exactly and approximately (e.g., with graphs), focusing on pairs of linear equations in two variables.

HSA-REI.8

8. (+) Represent a system of linear equations as a single matrix equation in a vector variable.

HSA-REI.9

9. (+) Find the inverse of a matrix if it exists and use it to solve systems of linear equations (using technology for matrices of dimension 3 × 3 or greater).

Used for High School grades of 9 -12

Tutorial

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