Subjects
Maths CBSE Live product
Class 9 (2026-27)
Introduction to Linear Polynomials
Patterns to Linear Graphs

10. CBQ - Mobile data plan

Question:

4 m.

A mobile data company charges a base fare of \(Rs.\) 150 and a cost of \(Rs.\) 30 per \(GB\).

1. What is the cost for \(0 \ GB\)?

150
180
30
210

2. For every increase in value of \(x\), the value of \(y\) increases by \(Rs.\)

150
30
180
210

3. The linear equation is

$y = - 30 x + 150$
$y = 30 x - 150$
$y = - 30 x - 150$
$y = 30 x + 150$

4. The slope is

150
−150
30
−30

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