Which of the following statements is not true ? (r is a positive integer)

1. If p < q then p - r < q - r

2. If p ≥ q then -pr ≥ -qr

3. If p > q, then $\dfrac{p}{r} \gt \dfrac{q}{r}$

4. If p ≤ q then p + r ≤ q + r

Which of the following statements is true? (r is a positive integer)

1. If p ≥ q, then $-\dfrac{p}{r} \le -\dfrac{q}{r}$

2. If p ≤ q then pr ≥ qr

3. If p > q, then -pr > -qr

4. If p < q then p - r > q - r

Which of the following is the correct graphical representation of {x : x < 1, x ∈ I} on the number line?

1.

2.

3.

4.

Which of the following is the correct graphical representation of {x : -4 < x ≤ 2, x ∈ R} on the number line?

1.

2.

3.

4.