3. Solve linear equations and inequalities in one variable, including equations with coefficients represented by letters.
6. Solve systems of linear equations exactly and approximately (e.g., with graphs), focusing on pairs of linear equations in two variables.
8. (+) Represent a system of linear equations as a single matrix equation in a vector variable.
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
When two lines cross each other that becomes and intersection point. Go to the link below to do some examples.
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