RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 15. Linear Inequations

Subject: Maths - Class 11th

Q. No. 21 of Exercise 15.2

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21

Solve each of the following system of inequations in R

Given


The above inequality can be split into two inequalities.


and


Let us consider the first inequality.



As x > 0, we have x + 1 > 0.



4 ≤ 3(x + 1)


4 ≤ 3x + 3


3x + 3 ≥ 4


3x + 3 – 3 ≥ 4 – 3


3x ≥ 1




(1)


Now, let us consider the second inequality.



As x > 0, we have x + 1 > 0.



3(x + 1) ≤ 6


3x + 3 ≤ 6


3x + 3 – 3 ≤ 6 – 3


3x ≤ 3



x ≤ 1


x (–∞, 1] (2)


From (1) and (2), we get




Thus, the solution of the given system of inequations is


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