Solve each of the following system of inequations in R
–5 < 2x – 3 < 5
Given –5 < 2x – 3 < 5
The above inequality can be split into two inequalities.
–5 < 2x – 3 and 2x – 3 < 5
Let us consider the first inequality.
–5 < 2x – 3
⇒ 2x – 3 > –5
⇒ 2x – 3 + 3 > –5 + 3
⇒ 2x > –2
⇒ x > –1
∴ x ∈ (–1, ∞) (1)
Now, let us consider the second inequality.
2x – 3 < 5
⇒ 2x – 3 + 3 < 5 + 3
⇒ 2x < 8
⇒ x < 4
⇒ x > –2
∴ x ∈ (–∞, 4) (2)
From (1) and (2), we get
x ∈ (–1, ∞) ∩ (–∞, 4)
∴ x ∈ (–1, 4)
Thus, the solution of the given system of inequations is (–1, 4).