Solve each of the following system of inequations in R
2x – 3 < 7, 2x > –4
Given 2x – 3 < 7 and 2x > –4
Let us consider the first inequality.
2x – 3 < 7
⇒ 2x – 3 + 3 < 7 + 3
⇒ 2x < 10
⇒ x < 5
∴ x ∈ ( –∞, 5) (1)
Now, let us consider the second inequality.
2x > –4
⇒ x > –2
∴ x ∈ (–2, ∞) (2)
From (1) and (2), we get
x ∈ (–∞, 5) ∩ (–2, ∞)
∴ x ∈ (–2, 5)
Thus, the solution of the given system of inequations is (–2, 5).