Page 5 - Focus KSSM SPM 2021 TG4.5 - Maths DLP

Chapter Learning Area: Relationship and Algebra
Form 4

6 Linear Inequalities in Two

Variables

You need more
exercise. My weight is 80 kg and my
height is 1.7 m. Where is my
category in body mass index?

Body Mass Index (BMI)
2.00

1.90

1.80 Underweight
Height (m) 1.70 Normal Overweight

1.60 Obese Clinically obese

1.50

1.40
40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130
Weight (kg)

• Boundary line – Garis sempadan
• Half-plane – Separuh satah
• Linear inequality – Ketaksamaan linear
• Linear inequalities in two variables – Ketaksamaan linear dalam dua pemboleh ubah
• Region – Rantau Concept
• System of linear inequalities – Sistem ketaksamaan linear map
• Variable – Pemboleh ubah

Linear inequalities in two variables are often used to find the solution for a system of linear
inequalities that involve some constraints. For example, the manager of a company makes inventory
so that the waste of capital in stock storage would not occur, engineers distribute raw materials

in the best way so that the cost is minimized and so on.

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06 Focus SPM Maths F4.indd 85 17/02/2021 5:24 PM