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Two bags each contains
x blocks respectively. x x 2 × x = 2x

Two bags each contains
x blocks respectively while x x y
another bag contains y blocks, 2x + y + 2
and 2 extra blocks are added.

Two bags each contains Total mass of the
x blocks respectively x x blocks in both bags
where the mass of each = 2 × x × p
block is p gram. = 2xp
CHAPTER
5 The total number or the mass of blocks which are written in numbers and variables,
x
for example, x, x + 3, x – 4, , 2x, 2x + y + 2, 2xp
2
are called algebraic expressions.
2

Yusri buys 5 apples which cost x sen each and 8 oranges which cost y sen each. Write an
algebraic expression for the total amount of money that he paid.

The total price of the apples = 5 × x The total price of the oranges = 8 × y
= 5x = 8y
The total payment = 5x + 8y

Self Practice 5.1b

1. Write an algebraic expression for each of the following situations:
(a) Subtract 7 from a number, x.
(b) The sum of y and z is divided by 9.
(c) The total number of people for x tents if each tent can accommodate 4 people.
(d) Madam Neo bought m kg of bream which costs RMp per kilogram and n kg of
hardtail scad which costs RMq per kilogram. What is the total payment?
(e) The age of Nazmi is h years old and Jagjit is k years old whereas the age of Izhar
is twice that of Jagjit. What is the difference in age between Nazmi and Izhar?

LEARNING
How do you determine the values of algebraic STANDARDS
expressions? Determine the values
of algebraic expressions
The value of an algebraic expression can be determined by given the values of
substituting the variables with given values. variables and make
connection with
appropriate situations.

108
Chapter 5

05 TB Math F1.indd 108 11/10/16 12:13 PM