Education Unit : SMP N 2 Ngemplak
Subject : Mathematics
Class / Semester : VIII / I
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B. Basic Competencies :
1.1 Solving systems of linear equations of two variables
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C. Indicator : 1.1.1 solving system of linear equation with two variables elimination method
D. Time allocation : 1 x 20 minutes
E. Objectives Learning
1. Learners can solve systems of linear equations with a mixture of two variables(elimination and substitution)
F. Teaching Materials
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Complete the syistem of linear equations of two variables using mixed methods (elimination and subtitusion)
Elimination = whilst removing or hiding any of the variables
Examples of problems:
Bowo and Radit went to a stationery store to buy books and pencils. Radit bought three books and two pencils at a price of Rp. 6500.00 and Bowo bought two books and pencils three for Rp. 6000.00. specify:
a. The price of a book
b. The price of a pencil
Suppose: the price of the book = b
the price of pencils = p
will be obtained is the equation becomes:
......... equation (1)
......... equation (2)
substituted into one equation, thus obtained:
So the price of 1 book = Rp 1000.00 and Rp 1500.00 price of a pencil
G. Learning methods
Expository and discussion methods.
H. Teaching and Learning Activities
Teacher’s activity
1) Intoduction (5 minutes)
The teacher gives greeting to the students : “Good morning my students”
The teacher leads the students to pray together : Before we start our lesson, please let’s pray together.
The teacher leads the students to pray together : Before we start our lesson, please let’s pray together.
The teacher asks the students about the student’s condition “How are you today?” then also ask about student’s presence “Any students absent today?”
Teachers to review the material as it is taught today on two variable linear equations.
2) Main Activities (14 minutes)
The teacher gives examples of issues the two variable system of linear equation with mixed methods (elimination and subtitution).
The teacher explains how to solve systems of linear equations of two variables using mixed methods to solve a given problem.
The teacher asks the students "what is there is still confusion solving systems of linear equations using a mixture of two variables?"
Teachers share the worksheets to work in groups.
After all work is completed worksheets, the teacher asked one representative of each group do the work at the board.
Teachers evaluate student work
3) Closing (1 minutes)
4) The teaching learning process is ended by pray together then the teacher gives greeting for the students : “Good afternoon my students!
Student’s activities
1) Intoduction (5 minutes)
The students answer the teacher’s greeting.
The students follow the teacher to pray together.
The students answer the teacher’s question.
The students pay attention the teacher’s explanation
2) Main Activities (14 minutes)
The students listen to the teacher’s explanation carefully.
The students answer the teacher
Students form groups
Students work on worksheets
Representatives from each group to write the discussion at the board
Students listen to the strengthening of teacher
3) Closing (1 minutes)
The students pray together and answer the teacher’s greeting.
I. Sources and Media
BSE Contextual Teaching and Learning Matematika kelas VII edisi 4, published by Departemen Pendidikan Nasional
J. Assessment
Procedure : Written assessment
Form of instrument: Test description
exercise:
1. Tutik go to the store to buy 1 kg of rice and 4 kg of cooking oil by paying Rp 14000.00. Joko also bought 2 kg of rice and 1 kg of cooking oil by paying Rp 10500.00. The price for 1 kg of rice and 1 kg of cooking oil is ....
2. Determine Settlement Association (HP) of the equation 2x + 3y = -5; x - 2y = -6 with mixed methods (substitution and elimination)
answer:
1. Suppose: the price of 1 kg of rice = s
the price of cooking oil 1 kg = b
then the equation will be obtained:
.........equation (1)
.........equation (2) score = 3
score = 4
substituted into one equation, example to equation (2) thus obtained:
So the price of 1 kg of rice = Rp 4000.00 and the price of cooking oil 1 kg Rp 2500.0 Score = 3
2. Form equqtion: score = 3
score = 4
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So it is HP {-4, 1} score = 3
Score = = 10
Teacher
Nafian Nurul Aziz
NIM. 09301249005
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