Which of the following is a linear inequation?

1. x² + 3 ≥ 2x - 7

2. $\dfrac{7}{(x - 1)} \lt 3x + 4$

3. $\dfrac{7}{3}x - 9 \le 5 + \dfrac{4}{7}x$

4. $5 - \dfrac{9}{x} \gt 3x + 4$

Which of the following is not a general form of a linear inequation?

1. ax + b > c

2. $\dfrac{a}{x}$ + b ≥ c

3. ax + b ≤ c

4. ax² + b < c

Which of following is not reducible to a linear inequation ?

1. $3 - \dfrac{7}{x} \lt 5$

2. $8 + \dfrac{3}{x} \ge \dfrac{5}{x} - 4$

3. $\dfrac{6}{x} - 8 \gt \dfrac{4}{x} + 3x$

4. $\dfrac{3}{x - 1} - 7 \lt 9$

Which of the following is not true for the linear inequations ?

1. Adding the same number to each side of an inequation does not change the inequality.

2. Multiplying each side of an inequation by the same positive number reverses the inequality.

3. Multiplying each side of an inequation by the same negative number reverses the inequality.

4. Dividing each side of an inequation by the same positive number does not change the inequality.