Lesson Plan

1. Standard of Competence :
   

   Solve the problems associated with linear equations systems and inequalities to three variables.
   

2. Basic Competence :
   

Solve the problems of linear equations systems with two variables.

1. Indicators :
   

   Students can determine the solution of linear equation system with three variables use:
   

   1. Substitution
      
   2. Elimination
      
   3. Graphic
      
2. Sources, Materials, and Media :
   

• Book :
  

  Dwi Sunar Prasetyono, 2008, Panduan Belajar Matematika I.
  

  Aritonang, 2007, Matematika SMA, Tiga Serangkai.
  

• Other contextual teaching resources
  

  
   

1. Learning and Teaching Methodology:
   

   Teaching method is given with slide presentation, lecturing class, discussing, asking answering and giving assignments.
   

2. Teaching steps:
   

   Class activities were designed in terms:
   

3. Initial
   

• The teacher delivers the learning goals to the students.
  
• The teacher motivates the students with giving explanation about the importance of studying this material.
  
• The teacher reopened the memory of linear equation system two variables as the based to learn linear equation system three variables.
  
• The teacher asks the students about the difficulties that they faced in previous lesson.
  
• The teacher gives the example about linear equation systems in our real life.
  

1. Main Activities
   

• The teacher gives slide presentation and at the same time lecturing the material to the students. The students watch and understand the slide presentation.
  
• The teacher divides the students in the class into 10 groups and gives the students time to discuss with their own group about the material.
  
• The teacher gives time to the students in their own groups for asking the difficulties about linear equation system three variables to the teacher.
  
• The teacher gives a chance to other groups if they have the answers for the question from other groups. If not, the teacher will answer the question.
  
• Some students present their knowledge about linear equation systems after discussing with their own groups, such as :
  

 

General form of linear equation system with three variables :

 

With a₁, a₂, a₃, b₁, b₂, b₃, c₁, c₂, c₃, d₁, d₂, dan d₃ is element Real.

To solve the linear equation system with three variables use :

1. Elimination method
   
2. Substitution method
   
3. Graphic method
   

• The teacher gives some exercises to the students. Then, the teacher gives feedback to the students.
  

1. Closing
   

• The teacher and the students conclude the conclusion about the material. Then, the teacher and the students give a reflection about the lesson at that time so that the next lesson will be better.
  
• The teacher gives an assignment to the students for next lesson.
  

1. Types of Assessments :
   

• Groups
  
• Individual
  
• Homework and assignments
  

1. Forms of Item Exercises :
   

• Academic writing and essay test
  

  
   

1. Example of exercise :
   

   Find the solution of linear equation system with three variables :
   

   
    

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2.     

 

3.