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Question
Solve : 7 > 3x - 8 ; x ∈ N.
Solution
7 > 3x – 8
⇒ 7 – 3x > 3x – 3x – 8 (Subtracting 3x)
⇒ 7 – 7 – 3x > 3x – 3x – 8 – 7 (Subtracting 7)
⇒ -3x > -15
⇒ x < 5 (Dividing by -3)
Required Answer = {1, 2, 3, 4}
Note : Division by negative number reverses the inequality.
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