Lesson Plan of Two Variables Linear Equation System

1. 1
LESSON PLAN
School Unit : Junior High School
Subject : Mathematics
Grade / Semester : VIII / 1
Time Allotment : 2 x 45 minutes
A. Standard Competence
2. Understanding linear equation system with two variables and using it in daily life
problems solving
B. Basic Competence
2.2. Construct mathematics model of given problem about linear equation system with two
variables
2.3. Solve mathematics model of given problem about linear equation system with two
variables
C. Indicator
Cognitive
- Construct mathematics model of given problem about linear equation system with two
variables
- Solve given daily life problems in mathematics model that related to linear equation
system with two variables
Affective
- Characterized Behavior
Helping others, and responsibility
- Social Skills
Communicating question, opinion, and etc in working team, team and tolerance with
other’s opinion
D. Learning Objective
Cognitive
- Given daily life problem about linear equation system with two variables and students
worksheet, students are able to construct mathematics model of given problem about linear
equation system with two variables
- Given daily life problem about linear equation system with two variables and students
worksheet, students are able to solve given daily life problems in mathematics model that
related to linear equation system with two variables
Affective
- Characterized Behavior
While doing discussion, students are more helpful to others and more responsible with the
task that given for them

2. 2
- Social Skills
While doing presentation and discussion, students are more able to have good
communication in discussion process such as asking a question, or speak up their opinion
E. Learning Topic
Learning Topic : Linear equation system with two variables
F. Learning Model / Method
Learning Model / Method : Cooperative
Learning Approach : Student Team Achievement Development (STAD)
G. Learning Activities
Preliminary (± 10 minutes)
Phase 1: Clarify aims and establish set
- Teacher explains learning objectives to students
- Teacher explains an apperception to students about how to solve linear equation system
with two variables that have been taught in the previous meeting and about linear equation
with one variable’s problem in daily life.
- Teacher gives motivation to students about application of linear equation system with two
variables related to daily life, such as:
Given the difference age between a father and his son now is 26 years, meanwhile five
years ago the both sum of their age is 34 years. Determine each of father’s age and his
son’s age two years later!
Main Activities (± 50 minutes)
Phase 2: Give the information (teach some part of topics) (± 10 minutes)
- Teacher explains to students about linear equation system with two variables in daily life.
- Teacher gives example about linear equation system with two variables in daily life and
how to solve it generally.
- Teacher communicates the topics with students by asking them for checking their
understanding
Phase 3: Organize students in group (± 5 minutes)
- Teacher helps students to make small heterogeneous group that consists of 3 – 4 students
- Teacher manages students to make group according to the last quiz result and arrange
them for preparing the discussion
- Teacher explains that after group activity, there is a short quiz to determine development
score of each student. Development score is difference score between initial score
(previous quiz about how to solve linear equation system with two variables) and last score
in this meeting. The development score will determine group succeeds in the end of this
meeting.
Phase 4 : Guides students in the group activity, students work in group (± 35 minutes)

3. 3
- Teacher gives students a worksheet for every group to be discussed
- Teacher gives a summary or any references that related to discussion topic
- Teacher guides students in group activity but teacher still gives students chance to practice
independently and works in group to solve the given problems.
- Teacher and students discuss student worksheet generally together.
- Teacher gives some comment or feedback to students’ work for checking their
understanding.
End Activity (± 30 minutes)
Phase 5 : Gives the evaluation (Quiz) (± 20 minutes)
- Teacher gives quiz about solving problem of linear equation system with two variables in
daily life to students individually.
Phase 6 : Gives reward (Group Award) (± 10 minutes)
- Teacher evaluates students quiz score
- Quiz score that have been gotten will be compared with the initial score for getting the
development score.
- Best group is group that has the highest average of development score.
- Teacher announces the best group at that meeting and praises them.
- Teacher also supports and appreciates the other groups for their work.
- Teacher gives reward to the best group by and preparing their certificate for the next
meeting.
- Teacher prepares students for next topic will be discussed.
H.References
Matematika Konsep dan Aplikasinya 2 untuk SMP Kelas VIII, Dewi Nuharini dan Tri
Wahyuni, BSE.
Contextual Teaching and Learning Matematika untuk SMP kelas VIII, Endah Budi R dkk.,
BSE.
I. Equipment
- Teaching Book
- Student Worksheet

4. 4
J. Assessment
Instrument : Student Worksheet
Assessment: Essay
Indicator Problem
Construct mathematics model of
given problem about linear
equation system with two
variables
Solve given daily life problems in
mathematics model that related to
linear equation system with two
variables
Student Worksheet
1. Given the difference age between a father and his
son now is 26 years, meanwhile five years ago the
both sum of their age is 34 years. Determine each
of father’s age and his son’s age two years later!
2. Given the price of a pencil and four books is Rp
14.000,00. The price of two pencils and a book is
Rp 10.500,00. Determine the price of a pencil and a
book!
3. The price of five Strawberry cupcakes and two
Blueberry cupcakes is Rp 40.000,00. The price of
two Strawberry cupcakes and three Blueberry
cupcakes is Rp 27.000,00. Determine the price of a
Strawberry cupcake and two Blueberry cupcakes!
Quiz
1. A football game match sold two types of tickets,
A class and B class. The sum of both tickets that
sold is 500 tickets. The price of an A class ticket is
Rp 8.000,00 and the price of an B class ticket is
Rp 6.000,00. If the total selling tickets obtained is
Rp 3.460.000,00, then determine each of ticket in
A class and B class that have been sold out!
2. Two distinct whole numbers have the difference is
15 and their sum is 55. Determine the
multiplication between both of them!
3. Jeny is 13 years old younger than her brother.
Nine years later, Jeny’s brother’s age is two times
Jeny’s age. Determine the sum of Jeny and his
brother’s ages!
4. The difference between Clara and Shena’s money
is Rp 3.000,00 when Clara’s money is greater than
Shena’s money. If two times Clara’s money is
added by three times Shena’s money then it
becomes Rp 66.000,00. Determine Clara’s money
and Shena’s money!
5. Given the sum of length and width of a rectangle
is 32 cm and the area of rectangle is 240 cm2
.
Determine the length and the width of the
rectangle!

5. 5
ASSESMENT SCORING RUBRIC
No Date :
Name Initial
Score
Quiz Score Development
Score
Note
1 Rindra Ayu L 90
2 Annisa Rizki F 79
3 Nur Endah P 78
4 Siti Nur Aini 80
5 Agustiana Z.A 92
6 Affiliatissalafiyah R 80
7 Ichwanu Thoyib 85
8 Neva Nerissa A 87
9 Amirul Khumaini S 83
Notice for Development Score:
a. More than 10 points lower than initial score 0 point
b. Between 1 until 10 points lower than initial score 10 points
c. Between 0 until 10 points higher than the initial score 20 points
d. More than 10 points higher than initial score 30 points
e. Perfect score in quiz score 30 points
Criteria of Group Development Score:
a. GOOD Team 15 – 19 points
b. GREAT Team 20 – 29 points
c. EXCELLENT Team >29 points

6. 6
REWARD ASSESMENT
No Group : 1
Members Total of
Development Score
Note
1 Agustiana Z.A
2 Ichwanu T
3 Siti Nur A’ini
Total
Development Average
NO Group : 2
Members Total of
Development Score
Note
1 Rindra Ayu L
2 Affiliatissalafiyah
3 Nur Endah P
Total
Development Average
No Group : 3
Members Total of
Development Score
Note
1 Annisa Rizki Fathia
2 Amirul Khumaini S
3 Neva Nerissa A
Total
Development Average