Chương II. §2. Hàm số bậc nhất

Members:
1. Nguyễn Thị Diễm Thúy
2. Lê Hoàng Uyên
3. Phan Tuyết Mai

AN LAC
MIDDLE SCHOOL
Welcome to our class!
Quiz
Question 1: What` s this?




What is function?
y is called a function of x when
for each value of x, we always identify only once corresponding value of y, then, and x is called variable.
Quiz
Question 2:
Which function is the increasing function?




When the value of x is increasing,
the corresponding value of y (or f(x)) is increasing then f(x) is called the increasing function.
When the value of x is increasing,
the corresponding value of y (or f(x)) is decreasing then f(x) is called the decreasing function.
Opening Problem
A bus from the Can Tho Bus Station to Ho Chi Minh City with the average speed is 42km per hour. Given that the Can Tho Bus Station is located 5 km far from the Center of Can Tho City.
Lesson 2:
LINEAR FUNCTIONS
Opening Problem

a. After departed an hour, how many kilometers did the bus travel?

b. After departed an hour, how far (in km) is the bus from the center of Can Tho city?
Opening Problem
c. Calculate the distance from the center of Can Tho city to the bus after the following period time given then complete the following table:

Definition:
Task 1:Work in groups
Answer:
Increasing Linear Functions,
Decreasing Linear Functions
Task 3:
Determine which linear functions in task 1 are increasing linear function and which one is decreasing.

Language Focus and Practice
Task 5: Return to the
Opening problem.

Given the distance from center of Can Tho city to Ho Chi Minh city is about 176km. How long does it take the bus to travel from Can Tho Bus Station to Ho Chi Minh city?
a. What is the independent and dependent variable and why ?
b. What are the units of measure?
c. Write out the calculation reguired to compute your pay if you sell 0 cars, 1 cars, 2 cars and 3 cars.
Homework:
You are working at a car dealer that pays you a monthly salary of 3.500.000 VND.
The dealer will also pay you 500.000 VND in commission for every car you sell.

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