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Algebra II Section 3-1. Objectives. Solve systems of linear equations by graphing. Determine whether a system of linear equations is consistent and independent, consistent and dependent, or inconsistent. System of Equations.

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## Algebra II Section 3-1

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**Algebra II Section 3-1**Section 3-1**Objectives**• Solve systems of linear equations by graphing. • Determine whether a system of linear equations is consistent and independent, consistent and dependent, or inconsistent Section 3-1**System of Equations**• A system of equations is two or more equations with the same variables. • The solution to a system of equations is an ordered pair; the ordered pair should be in alphabetical order. Section 3-1**Solve by Graphing**• Solve the system of equations by graphing x – 2y = 0 x + y = 6 Section 3-1**Types of Solutions**• Consistent if has at least one solution. • Inconsistent if has no solutions. Section 3-1**Consistent**• Independent if has exactly one solution. • Dependent if has an infinite number of solutions Section 3-1**Example #1**• Graph the system of equations and describe it as consistent and independent, consistent and dependent, or inconsistent. x – y = 5 x + 2y = - 4 Section 3-1**Example #2**• Graph the system of equations and describe it as consistent and independent, consistent and dependent, or inconsistent. 15x – 6y = 0 5x – 2y = 10 Section 3-1**Application**A service club is selling copies of their holiday cookbook to raise funds for a project. The printer’s set-up charge is $200, and each book costs $2 to print. The cookbooks will sell for $6 each. How many cookbooks must the members sell before they make a profit? Section 3-1

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