If the point R(5, 7) is the mid-point of the line segment joining the points P(3, y) and Q(x, 9), then (x + y) equals:

1. 7

2. 9

3. 12

4. 14

If the point (2, 1) is the mid-point of the line segment PQ joining the points $P\Big(\dfrac{9}{2}, -4\Big)$ and Q(a, b), then (a + b) is equal to:

1. $\dfrac{7}{4}$

2. $\dfrac{11}{4}$

3. $\dfrac{7}{2}$

4. $\dfrac{11}{2}$

Two vertices of a ΔABC are A(-1, 4) and B(5, 2) and its centroid is (0, -3). The coordinates of C are :

1. (4, 3)

2. (4, 15)

3. (-4, -15)

4. (-15, -4)

The mid-point of the line segment joining (4p, 5) and (2, 3q) is (5, 5p - 1). The values of p and q are respectively:

1. 2, $\dfrac{8}{3}$

2. -2, $\dfrac{8}{3}$

3. 2, $\dfrac{13}{3}$

4. -2, $\dfrac{13}{3}$