Find the distance between the following pair of points :

(a, b), (-a, -b)

A is a point on y-axis whose ordinate is 4 and B is a point on x-axis whose abscissa is -3. Find the length of the line segment AB.

Find points on the x-axis which are at a distance of 5 units from the point (5, -4).

Find points on the y-axis which are at a distance of 10 units from the point (8, 8).