The ratio in which the line segment joining P (3. –4) and Q(6, 7) is divided by x axis is

P (-4, b) and Q(2,b+2) are 2 points and the co-ordinates of the middle point of PQ are (-2,2) .The value of b is

The slope of the line Joining A (-4. 6) and B (5, 3) is