### Chapter 7 - Systems of Linear Equations

This chapter discusses systems of linear equations. It contains the following sections:
- section 7.1 - In this section we introduce
systems of linear equations, solutions, and talk about the graphical method of
solving a system of two equations in two unknowns.
- section 7.2 - In this section we
explain the substitution method of solving systems of equations.
- section 7.3 - In this section we
explain the elimination method of solving systems of equations.