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How do you solve problems?
LEARNING
STANDARDS
Solve problems
involving linear
After 10 years, Jalil’s age will be thrice his age this year. equations in
What is Jalil’s age? one variable.

Understanding the problem
After 10 years, Jalil’s age is thrice his age this year.
The steps to solve
problems involving
Devising a plan
linear equations in
Let Jalil’s current age = x years old one variable:
After 10 years, Jalil’s age = 3 × x Identify the variable
= 3x in the problem and
Linear equation in one variable that can be formed is represent the variable
CHAPTER
6
x + 10 = 3x. with a letter.
Implementing the Form a linear equation
strategy based on the
x + 10 = 3x information given.
x + 10 – x = 3x – x
Solve the equation
10 = 2x to find the value of
10 = 2x the variable.
2 2
5 = x
Jalil is 5 years old.
Think Smart
The sum of three
Doing reflection
consecutive odd
When x = 5, 5 + 10 = 3(5) numbers is 63. What
= 15 are the numbers?

Self Practice 6.1d

1. In a mathematics test, Azmah scored 17 marks more than Yazid while Suzana’s score
is twice of Yazid’s score. If their total score is 161, what is Azmah’s score?

2. The diagram shows a rectangle. If the perimeter of the (2x + 1) cm
rectangle is 66 cm, what is the area of the rectangle?
(x + 5) cm

130
Chapter 6

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