The rally begins with 120 members. Every hour, 9 members leave the group. Therefore, after n hours, the number of remaining members is represented by the expression 120 minus 9n. This shows a linear decay pattern.
A rally starts with 120 members. Each hour, 9 members drop out of the group. How many members will remain after 1, 2, 3, … hours? Find a linear expression to represent the number of members at the end of the nth hour.
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At the beginning, the rally has 120 members. Every hour, 9 members drop out of the group. After 1 hour, the number becomes 111. After 2 hours, it becomes 102 and the decrease continues regularly. If n represents the number of hours, then the number of members remaining after n hours can be written as 120 minus 9n. This expression forms a linear pattern because the number of members decreases by the same amount every hour.
For more NCERT Solutions for Class 9 Maths Ganita Manjari Chapter 2 Introduction to Linear Polynomials (2026-27):
https://www.tiwariacademy.com/ncert-solutions/class-9/maths/ganita-manjari-chapter-2/