Section Formula | Internal and External Division by a Point

Here you can understand the section formula of a point which divides the line internally and externally.
Find the coordinates of the point which divides the points A(-7,4) and B(8,9) internally in the ratio 2:3
Find the coordinate of the point which divides externally the join of the pair of the points A(1,-2) and B(4,7) in the ratio of 2:3