Solve each of the following system of inequations in R

x + 5 > 2(x + 1), 2 – x < 3(x + 2)

Given x + 5 > 2(x + 1) and 2 – x < 3(x + 2)


Let us consider the first inequality.


x + 5 > 2(x + 1)


x + 5 > 2x + 2


x + 5 – 5 > 2x + 2 – 5


x > 2x – 3


2x – 3 < x


2x – 3 + 3 < x + 3


2x < x + 3


2x – x < x + 3 – x


x < 3


x (–∞, 3) (1)


Now, let us consider the second inequality.


2 – x < 3(x + 2)


2 – x < 3x + 6


2 – x – 2 < 3x + 6 – 2


–x < 3x + 4


3x + 4 > –x


3x + 4 – 4 > –x – 4


3x > –x – 4


3x + x > –x + x – 4


4x > –4



x > –1


x (–1, ∞) (2)


From (1) and (2), we get


x (–∞, 3) (–1, ∞)


x (–1, 3)


Thus, the solution of the given system of inequations is (–1, 3).


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